<dot.> and <with:colon> implicit escaping of angle brackets isn't working

[apjanke]

Exposed by adding a roff test for angle_bracket_syntax, following #48.

Low priority - looks to me like this has been broken for a while, and nobody has noticed it or complained, which means that probably nobody is using this feature.

You can now see a warning that's issued when this syntax is encountered:

bundle exec rake test
Loaded suite /usr/local/lib/ruby/gems/2.7.0/bin/rake
Started
......................................warn: unrecognized inline tag: ["dot."]
................................
Finished in 13.540875 seconds.
-------------------------------------------------------------------------------------------------------------------------------------------------------
70 tests, 112 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
100% passed
-------------------------------------------------------------------------------------------------------------------------------------------------------
5.17 tests/s, 8.27 assertions/s

And the text disappears from the roff output:

.P
or when \fB<WORD>\fR is enclosed in backticks\.
.P
or when \fIWORD\fR has a

[apjanke]

Looks like this is the same thing as #102. Closing this ticket as a dupe of that one. I think it's fixed now, and the fix was to just update the test: I don't think there actually was supposed to be implicit escaping in this case; the doco and test code seems to indicate that . and : are exceptions to the implicit escaping behavior.