Rename test
Add new MethodCallToString impl that includes constructor params
Get enclosing class's constructor params in memoize macro
Refactor macros
Add comments
Now would be a good time to fix that typo...

"convertor" -> "converter"
[skip ci] Update readme
[skip ci] Better wording in readme
Merge pull request #21 from cb372/constructor-params-in-cache-key

Constructor params in cache key