Support various number of digits after the comma in the timestamp %f …

[bbertincourt]

…format

This PR adds a small modification to support various number of digits (1 to 6) after the comma to be picked up and recognized by the "%f" directive as it does with datetime.strptime.

I believe this also answers https://github.com/r1chardj0n3s/parse/issues/127

Current State

from parse import parse

ok_result = parse("{:%H:%M:%S.%f}", "12:34:56.789000")
print(ok_result)

fail_result = parse("{:%H:%M:%S.%f}", "12:34:56.789")
print(fail_result)  # is None

Output[]

<Result (datetime.time(12, 34, 56, 789000),) {}>
None

Desired State

Output[]

<Result (datetime.time(12, 34, 56, 789000),) {}>
<Result (datetime.time(12, 34, 56, 789000),) {}>

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All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.65%. Comparing base (8ae5d30) to head (b1d2121). Report is 8 commits behind head on master.

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```diff @@ Coverage Diff @@ ## master #178 +/- ## ======================================= Coverage 94.65% 94.65% ======================================= Files 1 1 Lines 543 543 Branches 132 132 ======================================= Hits 514 514 Misses 18 18 Partials 11 11 ```

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[wimglenn]

This seems reasonable. Thanks for the contribution!

[bbertincourt]

@wimglenn I have these weirdly formatted log exports that parse does a really good job on. Helps me really, thanks for maintaining parse.