tiny fixes

[ocramz]

• fixed an import warning due to version bounds on the library itself
• specified that the type parameter of Language must be Type -> Type
• include the README in released package
• ensure links to package modules render correctly
• some rewording in the readme
• bumped version number to 0.2

[alt-romes]

Thank you, it's great!

Thanks for improving the README, I appreciate it. Overall I think we can still make it much better, but I wanted to do so incrementally as in this MR or e.g. to answer questions made by actual users of the library, instead of writing it too much upfront.

Regarding the version bump: it should actually be a minor bump since there are no breaking changes (following major.major.minor.other scheme).

However, the checks have already passed, and there are some changes being discussed in #1 and #3 that will warrant the major version bump, so we'll just merge it as is.