fix(format): remove dot and colon characters from escape function

[dbarria]

When a paragraph contains the dot or colon characters, the generated markdown escapes those characters breaking the markdown visualization in other tools than Github.

This commit removes those characters from the escape function and apparently doesn't affect the other escape logic.

[dmvolod]

@dbarria it looks like the effect of an issue #68 and should be fixed before

[dbarria]

@dbarria it looks like the effect of an issue #68 and should be fixed before

@dmvolod Could you elaborate, please? Where do you think it should be fixed?

[fulviodenza]

@dbarria it looks like the effect of an issue #68 and should be fixed before

This should be the PR that fixes the issue I opened, isn't it?

[dmvolod]

Oh, sorry @dbarria my bad, you've fixed the core of the #68, missed this.

[princjef]

Thanks for the change and updating the tests!

[princjef]

@dbarria thanks for the PR! Out of curiosity, what tool(s) do you work with that have trouble with the backslash escaping?

[codecov-commenter]

Codecov Report

Merging #70 (91c9bb4) into master (2efd0c5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #70   +/-   ##
=======================================
  Coverage   67.82%   67.82%           
=======================================
  Files          17       17           
  Lines        1557     1557           
=======================================
  Hits         1056     1056           
  Misses        415      415           
  Partials       86       86           

Impacted Files	Coverage Δ
format/formatcore/base.go	44.54% <ø> (ø)

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