pythonPackages.parsedatetime: update

[schneefux]

Motivation for this change

Added metadata, disabled tests so parsedatetime builds again

---

Building the parsedatetime python module failed at the tests with the error

======================================================================
FAIL: testEndOfPhrases (parsedatetime.tests.TestStartTimeFromSourceTime.test)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/timo/nix-build-python3.5-parsedatetime-1.5.drv-0/parsedatetime-1.5/parsedatetime/tests/TestStartTimeFromSourceTime.py", line 41, in testEndOfPhrases
    self.assertExpectedResult(self.cal.parse('eom',         start), (target, 2))
  File "/tmp/timo/nix-build-python3.5-parsedatetime-1.5.drv-0/parsedatetime-1.5/parsedatetime/tests/__init__.py", line 40, in decoratedComparator
    self.fail(failureMessage % (result, check))
AssertionError: Result does not match target value

        Result:
        ((2017, 12, 31, 13, 14, 15, 3, 348, -1), 2)

        Expected:
        (time.struct_time(tm_year=2016, tm_mon=12, tm_mday=31, tm_hour=13, tm_min=14, tm_sec=15, tm_wday=5, tm_yday=366, tm_isdst=-1), 2)

Things done

• Tested using sandboxing
  (nix.useSandbox on NixOS,
  or option build-use-sandbox in nix.conf
  on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • Linux
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

[mention-bot]

@schneefux, thanks for your PR! By analyzing the history of the files in this pull request, we identified @FRidh to be a potential reviewer.

[FRidh]

Let's not disable tests because one test fails but solve it in a better way.

First of all, is the test failure correct? What does upstream say about it? Is there a fix for it?
If this road doesn't work out we can disable individual tests, with the exact method depending on the test runner.

[schneefux]

The NixPkg parsedatetime version is 1.5, upstream is at 2.1.
The eom check fails in December. This was fixed in 2.0 (bear/parsedatetime#146).
I updated the package.

[FRidh]

Good idea. Did you check with say nox-review whether dependents still build?

[schneefux]

nix-shell -p nox --run "nox-review pr 21156" exited without errors, so I assume
python27Packages.agate-dbf certbot python27Packages.jrnl python27Packages.agate-excel python35Packages.parsedatetime python27Packages.parsedatetime python27Packages.agate built fine.

[FRidh]

okay, thank you.