gh feed command improvements

[donnemartin]

 $ gh feed donnemartin/gitsome -p

Newlines

Newlines are stripped for compatibility with click.wrap_text. A space should be added in their place for legibility instead of removing them entirely

Tags

Shows:

1. donnemartin released donnemartin/gitsome (24 minutes ago)

Should be:

1. donnemartin released 0.5.0 at donnemartin/gitsome (24 minutes ago)

Pull requests and issue titles:

3. donnemartin closed pull request repos/donnemartin/gitsome#45 (4 minutes ago)

Should be:

3.   donnemartin closed pull request repos/donnemartin/gitsome#45 (4 minutes ago)
         Add Terms of Service and Privacy policy

Commit/pull request comments:

72. janschulz commented on commit ac286ac at donnemartin/gitsome (Yesterday)

Should be:

72.  janschulz commented on commit ac286ac at donnemartin/gitsome (Yesterday)
         @donnemartin: Is there any reason for the `==`dependencies
         or can these be changed to `>=`? I', trying to package this for the
         conda-forge ecosystem and e.g. the requests dependency downgrades my
         conda root environment requests install :-/