Address reported pylint issues

[Andrew Hawker]

Either fix the reported issue or explicitly add an ignore to silence the warning if it's "written as intended".

Issues:

hawker@mbp:~/src/github.com/ahawker/ulid|master⚡
⇒  make lint
************* Module ulid
W: 11, 0: Wildcard import api (wildcard-import)
W: 13, 0: Wildcard import ulid (wildcard-import)
************* Module ulid.api
C: 21, 0: Invalid constant name "TimestampPrimitive" (invalid-name)
C: 27, 0: Invalid constant name "RandomnessPrimitive" (invalid-name)
************* Module ulid.hints
C: 12, 0: Invalid constant name "Buffer" (invalid-name)
************* Module ulid.ulid
C:191, 8: Invalid variable name "ms" (invalid-name)
make: *** [lint] Error 20