update app.src for latest rebar3

Merge pull request #69 from fogfish/generic

Generics for product type

Use git for version control

release 4.5.0

release 4.4.0

Merge pull request #50 from fogfish/minimal-R17-support

Fix compile failure with R17 and maps

release 4.3.2

Update changelog of release 4.3.0

update build system to support coveralls io

update the category doc with links to monads