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Important notice: this release drops Python 2 support

new defaults:

• support for submodules (@han190)
• formatting of end statements (@helmutwecke)
• indentation for forall and where (@helmutwecke)
• indentation rules for fypp preprocessor statements (@helmutwecke)

fixes:

• support for multiline strings
• parsing of +/- in addition/subtraction

New options:

• --config-file for custom configuration file (@ellio167)
• --diff (@jhaiduce)
• --exclude to exclude files from recursive file search (@jhaiduce)
• --case letter case formatting of Fortran intrinsics (@meteokid)
• --disable-indent-mod disable indentation after module / program
• --enable-decl whitespace formatting for variable declarations (::)

bug fixes

• use of config files (via optional dependency configargparse) (contributed by @dbroemmel)
• more options for whitespace formatting and line-length (contributed by @dbroemmel)
• more intrinsic statements recognised (contributed by @dbroemmel)
• option to replace relational statements (contributed by @dbroemmel)
• alignment of use statements
• various bug fixes

• more customizable and more formatting options
• support for multiline strings and statement labels
• compatibility with fypp preprocessor directives
• various bug fixes

Mostly bug fixes

• Tested with large Fortran code base
• Improved support for Fortran 2003 / 2008
• Bug fixes
• Unicode support

proper Python packaging

• more stable for incomplete syntax
• Support more Fortran 03/08 constructs
• Proper testing
• Python style fixes

• Extract stable and useful features from cp2k fprettify
• Examples and improved tester
• add README.md