add a sample spec with invisible text

This PDF sets the alpha constant to 0 for some of the text. For now, pdf-reader ignores the alpha constant and extracts all text. There's a possibility the text extraction will gain an option to ignore invisible characters though, in which case this sample will come in handy. See #43
yob · Oct 18, 2019 · ee7a572 · ee7a572
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diff --git a/spec/data/invisible.pdf b/spec/data/invisible.pdf
diff --git a/spec/integrity.yml b/spec/integrity.yml
@@ -209,6 +209,9 @@ data/invalid/trailer_is_not_a_dict.pdf:
 data/invalid/trailer_root_is_not_a_dict.pdf:
   :bytes: 108807
   :md5: e00b7fc6999ca722aa31d2bb90f1e5d0
+data/invisible.pdf:
+  :bytes: 14364
+  :md5: 563f7ec8eb2c4d54f00fd85d807580c0
 data/junk_prefix.pdf:
   :bytes: 934
   :md5: c03c9a96cdefa78c9475b619d87e39bf