Minor fixes for messages

[eode]

This includes some small fixes, such as a missing 'f' for an f-string, quoting strings in error output for clarity, and the like.

Examples:

• Unknown compresser lzo
  • becomes: Unknown compresser "lzo"
• "Openning" becomes "Opening"
• Unknown pickler foo. Available values are {list(cls._pickler_registry)}
  • becomes: Unknown pickler "foo". Available values are ["bar", "baz", "bat"]

Exceptions:

• Because it is a module name, "compresser" is not changed to "compressor", and all spellings of the word are left as-is.

Different project leaders prefer different PR styles. If you find it acceptable, I'll just include these kinds of changes in with my other, code-related PRs. If you'd rather, though, I can keep spelling/message PRs separate from code PRs, as I have this one. Please inform!

[codecov[bot]]

Codecov Report

Merging #42 (67e7364) into master (8c3493b) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #42   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           23        23           
  Lines          455       455           
=========================================
  Hits           455       455           

Impacted Files	Coverage Δ
compress_pickle/compressers/registry.py	100.00% <ø> (ø)
compress_pickle/picklers/registry.py	100.00% <ø> (ø)

[eode]

Note that I've also updated requirements-dev.txt to include cloudpickle and dill, as some tests fail without them. Just mentioning that explicitly in case it's not what you want.

[eode]

This is ready, as far as I'm concerned.