Commit 5a14efcef broke input from stdin, with the check added for actually existing files. Add an exception when the file input is "-" so reading from stdin works again. The original commit that introduced this feature did not include documentation. Add documentation to "--help", manpages and the README. Add testing for reading from stdin with python3 so future commits will not break the feature unintentionally.
Commit 5a14efcef broke input from stdin, with the check added for actually existing files. Add an exception when the file input is "-" so reading from stdin works again. The original commit that introduced this feature did not include documentation. Add documentation to "--help", manpages and the README. Add testing for reading from stdin with python3 so future commits will not break the feature unintentionally.
Fixes: #270