chore(deps): update dependency ember-cli-showdown to v6

package.json

@@ -35,7 +35,7 @@
     "ember-cli-qunit": "4.4.0",
     "ember-cli-release": "1.0.0-beta.2",
     "ember-cli-shims": "1.2.0",
-    "ember-cli-showdown": "4.5.0",
+    "ember-cli-showdown": "6.0.0",
     "ember-cli-uglify": "3.0.0",
     "ember-composable-helpers": "2.4.0",
     "ember-concurrency": "1.3.0",

yarn.lock

@@ -4773,7 +4773,7 @@ babel-plugin-htmlbars-inline-precompile@^2.1.0:
   resolved "https://registry.yarnpkg.com/babel-plugin-htmlbars-inline-precompile/-/babel-plugin-htmlbars-inline-precompile-2.1.1.tgz#59edd4eab28d27fbafa26d51bc19795278d103a9"
   integrity sha512-obo5//IFrEZNAQovcXxOXLn5nwkQ0Y+xhR7AMg1sYR6W7KxQLZI9/XzbIytVhjwwY+Bd2e0+qyHEplJbHyZ1Og==
 
-babel-plugin-htmlbars-inline-precompile@^5.3.0:
+babel-plugin-htmlbars-inline-precompile@^5.0.0, babel-plugin-htmlbars-inline-precompile@^5.3.0:
   version "5.3.0"
   resolved "https://registry.yarnpkg.com/babel-plugin-htmlbars-inline-precompile/-/babel-plugin-htmlbars-inline-precompile-5.3.0.tgz#eeaff07c35415264aea4d6bafb5e71167f6ffb2f"
   integrity sha512-WeLBQM5Y9rx2GbwfxKy47lWh+u23afdlb48sM+5RTMTLwO90oILA7znzzOls7e+bcj06Nw0H+xpRWuyhlS37hg==
@@ -5994,7 +5994,7 @@ broccoli-output-wrapper@^3.2.5:
     heimdalljs-logger "^0.1.10"
     symlink-or-copy "^1.2.0"
 
-broccoli-persistent-filter@^1.0.3, broccoli-persistent-filter@^1.1.5, broccoli-persistent-filter@^1.1.6, broccoli-persistent-filter@^1.4.2, broccoli-persistent-filter@^1.4.3:
+broccoli-persistent-filter@^1.1.5, broccoli-persistent-filter@^1.1.6, broccoli-persistent-filter@^1.4.2, broccoli-persistent-filter@^1.4.3:
   version "1.4.3"
   resolved "https://registry.yarnpkg.com/broccoli-persistent-filter/-/broccoli-persistent-filter-1.4.3.tgz#3511bc52fc53740cda51621f58a28152d9911bc1"
   integrity sha512-JwNLDvvXJlhUmr+CHcbVhCyp33NbCIAITjQZmJY9e8QzANXh3jpFWlhSFvkWghwKA8rTAKcXkW12agtiZjxr4g==
@@ -6957,6 +6957,11 @@ common-tags@^1.4.0:
   dependencies:
     babel-runtime "^6.26.0"
 
+common-tags@^1.8.0:
+  version "1.8.0"
+  resolved "https://registry.yarnpkg.com/common-tags/-/common-tags-1.8.0.tgz#8e3153e542d4a39e9b10554434afaaf98956a937"
+  integrity sha512-6P6g0uetGpW/sdyUy/iQQCbFF0kWVMSIVSyYz7Zgjcgh8mgw8PQzDNZeyZ5DQ2gM7LBoZPHmnjz8rUthkBG5tw==
+
 commoner@~0.10.3:
   version "0.10.8"
   resolved "https://registry.yarnpkg.com/commoner/-/commoner-0.10.8.tgz#34fc3672cd24393e8bb47e70caa0293811f4f2c5"
@@ -7908,16 +7913,6 @@ ember-cli-htmlbars@6.0.0:
     strip-bom "^4.0.0"
     walk-sync "^2.2.0"
 
-ember-cli-htmlbars@^2.0.3:
-  version "2.0.3"
-  resolved "https://registry.yarnpkg.com/ember-cli-htmlbars/-/ember-cli-htmlbars-2.0.3.tgz#e116e1500dba12f29c94b05b9ec90f52cb8bb042"
-  integrity sha512-oyWtJebOwxAqWZwMc0NKFJ8FJdxVixM7zl0FaXq1vTAG6bOgnU7yAhXEASlaO5f+PptZueZfOpdpvRwZW/Gk1A==
-  dependencies:
-    broccoli-persistent-filter "^1.0.3"
-    hash-for-dep "^1.0.2"
-    json-stable-stringify "^1.0.0"
-    strip-bom "^3.0.0"
-
 ember-cli-htmlbars@^3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/ember-cli-htmlbars/-/ember-cli-htmlbars-3.0.1.tgz#01e21f0fd05e0a6489154f26614b1041769e3e58"
@@ -7928,6 +7923,28 @@ ember-cli-htmlbars@^3.0.1:
     json-stable-stringify "^1.0.0"
     strip-bom "^3.0.0"
 
+ember-cli-htmlbars@^5.7.1:
+  version "5.7.1"
+  resolved "https://registry.yarnpkg.com/ember-cli-htmlbars/-/ember-cli-htmlbars-5.7.1.tgz#eb5b88c7d9083bc27665fb5447a9b7503b32ce4f"
+  integrity sha512-9laCgL4tSy48orNoQgQKEHp93MaqAs9ZOl7or5q+8iyGGJHW6sVXIYrVv5/5O9HfV6Ts8/pW1rSoaeKyLUE+oA==
+  dependencies:
+    "@ember/edition-utils" "^1.2.0"
+    babel-plugin-htmlbars-inline-precompile "^5.0.0"
+    broccoli-debug "^0.6.5"
+    broccoli-persistent-filter "^3.1.2"
+    broccoli-plugin "^4.0.3"
+    common-tags "^1.8.0"
+    ember-cli-babel-plugin-helpers "^1.1.1"
+    ember-cli-version-checker "^5.1.2"
+    fs-tree-diff "^2.0.1"
+    hash-for-dep "^1.5.1"
+    heimdalljs-logger "^0.1.10"
+    json-stable-stringify "^1.0.1"
+    semver "^7.3.4"
+    silent-error "^1.1.1"
+    strip-bom "^4.0.0"
+    walk-sync "^2.2.0"
+
 ember-cli-import-polyfill@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/ember-cli-import-polyfill/-/ember-cli-import-polyfill-0.2.0.tgz#c1a08a8affb45c97b675926272fe78cf4ca166f2"
@@ -8026,19 +8043,16 @@ ember-cli-shims@1.2.0:
     ember-rfc176-data "^0.3.1"
     silent-error "^1.0.1"
 
-ember-cli-showdown@4.5.0:
-  version "4.5.0"
-  resolved "https://registry.yarnpkg.com/ember-cli-showdown/-/ember-cli-showdown-4.5.0.tgz#6ea0d28ced62fd5feb92799bc90d6a4857ceb5a7"
-  integrity sha512-i1XXua2oOqJHGozLw+cXI2zjrfSaamH+qAKt8kLnKTjxDXO175bDUnBtrTR1uMH75S56iIkCBdCSyOMq5haB+g==
+ember-cli-showdown@6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/ember-cli-showdown/-/ember-cli-showdown-6.0.0.tgz#04ba8d6590bfca461159a0181f63373b9b1de7b0"
+  integrity sha512-EwkvftojVjAXyMdRXU33YZyLAJEXD5E94D2z1J/P4O4KSg5nQzH27Pd3QEdL/tmlY0anLVKoIpom87YyTOUcuw==
   dependencies:
     broccoli-funnel "^2.0.0"
     broccoli-source "^1.1.0"
     broccoli-string-replace "^0.1.2"
-    ember-cli-babel "^6.8.1"
-    ember-cli-htmlbars "^2.0.3"
-    ember-cli-import-polyfill "^0.2.0"
-    ember-cli-version-checker "^2.1.2"
-    ember-getowner-polyfill "^2.0.1"
+    ember-cli-babel "^7.26.6"
+    ember-cli-htmlbars "^5.7.1"
     resolve "^1.8.1"
     semver "^5.5.0"
     showdown "^1.8.6"
@@ -8386,7 +8400,7 @@ ember-get-config@:
     ember-cli-version-checker "^2.1.0"
     ember-factory-for-polyfill "^1.3.1"
 
-ember-getowner-polyfill@^2.0.0, ember-getowner-polyfill@^2.0.1:
+ember-getowner-polyfill@^2.0.0:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/ember-getowner-polyfill/-/ember-getowner-polyfill-2.0.1.tgz#9bfe2b4d527ed174e76fef2c8f30937d77cb66fb"
   integrity sha1-m/4rTVJ+0XTnb+8sjzCTfXfLZvs=