Pick version from Version file instead of Hardcoded

Signed-off-by: Sachin <sachin.jain@chef.io>

habitat/plan.ps1

@@ -3,8 +3,7 @@ $PSDefaultParameterValues['*:ErrorAction']='Stop'
 
 $pkg_name="fauxhai"
 $pkg_origin="core"
-$pkg_version="9.3.16"
-$pkg_revision="1"
+$pkg_version=$(Get-Content "$PLAN_CONTEXT/../VERSION")
 $pkg_maintainer="The Chef Maintainers <humans@chef.io>"
 
 $pkg_deps=@(
@@ -15,6 +14,19 @@ $pkg_bin_dirs=@("bin"
                 "vendor/bin")
 $project_root= (Resolve-Path "$PLAN_CONTEXT/../").Path
 
+function pkg_version {
+    Get-Content "$SRC_PATH/VERSION"
+}
+
+function Invoke-Before {
+    Set-PkgVersion
+}
+
+# Invoke-Before hook to set package version early
+function Invoke-Before {
+    Set-PkgVersion
+}
+
 function Invoke-SetupEnvironment {
     Push-RuntimeEnv -IsPath GEM_PATH "$pkg_prefix/vendor"