Read php-semver-checker-git.yaml configuration file by default

[tomzx]

• If a php-semver-checker-git.json file is found in the current working directory, read it as the configuration file.
• If a configuration option is given to the command line, this configuration file takes precedence over the one in the current working directory.
• Finally, any option given on the command line overrides what is in the configuration file.

[nochso]

Almost done with this. See related: tomzx/php-semver-checker#72