bump-formula-pr: handle additional edge cases

[EricFromCanada]

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Allow bump-formula-pr to work with formulae that:

• use a URL that specifies only a revision, and a version (e.g. acme, colortail, pytouhou)
  brew bump-formula-pr -f -n acme --version=0.98 --revision=277
• use a repository URL providing an autodetected version (e.g. smpeg)
  brew bump-formula-pr -f -n smpeg --url=svn://svn.icculus.org/smpeg/tags/release_0_4_6/ --revision=400

Fixes #9462.

Currently exposes an issue with formulae that specify the revision as an integer rather than a string, i.e. fuego, netpbm, spim. (Update: addressed in Homebrew/homebrew-core#66558)

$ brew bump-formula-pr -f -n spim --version=9.2 --revision=800
==> replace 732 with "800"
Error: wrong argument type Integer (expected Regexp)
/usr/local/Homebrew/Library/Homebrew/utils/string_inreplace_extension.rb:36:in `gsub!'
/usr/local/Homebrew/Library/Homebrew/utils/string_inreplace_extension.rb:36:in `gsub!'
/usr/local/Homebrew/Library/Homebrew/utils/inreplace.rb:78:in `block in inreplace_pairs'
/usr/local/Homebrew/Library/Homebrew/utils/inreplace.rb:71:in `each'
/usr/local/Homebrew/Library/Homebrew/utils/inreplace.rb:71:in `inreplace_pairs'
/usr/local/Homebrew/Library/Homebrew/dev-cmd/bump-formula-pr.rb:332:in `bump_formula_pr'
/usr/local/Homebrew/Library/Homebrew/brew.rb:119:in `<main>'

[BrewTestBot]

Review period will end on 2020-12-10 at 03:16:03 UTC.

[MikeMcQuaid]

Nice catch again!

[BrewTestBot]

Review period ended.