Remove confusing wording in README.md

See: https://github.com/aFarkas/html5shiv/commit/7c26bba0f22a5069ed3d1c28edc0615cab203b39#commitcomment-3859539
Merge pull request #118 from drzax/patch-2

Remove confusing wording in README.md
Supports tag names with hyphens like foo-bar.
Merge pull request #124 from bitovi/master

Supports tag names with hyphens like foo-bar.
ignore more files in bower.json
Merge pull request #127 from kidwm/master

ignore more files in bower.json
3.7.0 (fixes Issue #125)
Update files to 3.7
Create NuGet Package for 3.7