Fix: position is incorrect when the desired marker has not been found.
Add branch-alias CI test.
Bump branch alias.
Merge pull request #27 from discordier/hotfix/determine-correct-position

Fix: position is incorrect when the desired marker has not been found.
Merge branch 'release/1.8.1'
Merge tag '1.8.1' into develop

Version 1.8.1
Fix the branch alias CI test.
Rework to match PSR1/PSR2 standards.
Require php >= 5.4.