Added instructions for mercurial pre-commit
Added instructions for mercurial pre-commit

TimeIncOSS/git-lint,TimeIncOSS/git-lint,stfp/git-lint,stfp/git-lint,sk-/git-lint,stfp/git-lint,sk-/git-lint,stfp/git-lint,stfp/git-lint,sk-/git-lint,sk-/git-lint,stfp/git-lint,sk-/git-lint,sk-/git-lint,sk-/git-lint,TimeIncOSS/git-lint,sk-/git-lint,sk-/git-lint,stfp/git-lint,TimeIncOSS/git-lint,TimeIncOSS/git-lint,TimeIncOSS/git-lint,TimeIncOSS/git-lint