Previously, it would query the size from the wrong dict and obtain
the value 0 all the time. This would have made every upload fail with
`UploadSizeLimitExeeded`.
Now we obtain the actual size limit, and will ignore it if unset/0
for some reason.
Patch += 1
Make it cristal clear what the crate version means, and what version of
the documentation you are looking at. Also do this in the README file.
Assure that 'Google' is capitalized.
That way, crate names reveal exact inforamtion about the contained
API revision.
* crate version: code gen version
* +<revision> (build-metadata): exact version of API schema
Fixes#38
