Release v0.6.0

• usage guide and #shellcheck -> # shellcheck
• contextOpen added, isPyCharm and new-release hook fixes
• default version-already and version-created hooks now do contextOpen instead
• Spelling and general documentation cleanup
• Cleaned up README.md
• Removed all usages of echo
• Added gitRepositoryWasModified, gitShowChanges, gitShowStatus, gitInsideHook