Bump to version 0.6.1

This release corrects the version number of the Golang script.

Add PULLREQ_EDITMSG to list of monitored files

Thanks to @rhuss for the pull request. A complementary change will also be made to the git-edit-atom Atom package.

Update success message

linux_amd64.tar.gz
linux_386.tar.gz
linux_arm64.tar.gz
linux_arm.tar.gz
darwin_amd64.tar.gz
windows_amd64.zip
windows_386.zip

Update Usage and Author information

linux_amd64.tar.gz
linux_386.tar.gz
linux_arm64.tar.gz
linux_arm.tar.gz
darwin_amd64.tar.gz
windows_amd64.zip
windows_386.zip

Release cross-compiled binaries

This release provides cross-compiled executables to allow the project to easily be installed across a range of architectures and operating systems.