view .arcconfig @ 36234:48783333f45c stable

date: fix parsing months

Thanks nemo for discovering this on #mercurial IRC channel.

Test Plan:
Add a test. It fails before this patch:

```
+  hg: parse error: invalid date: 'Feb 2018'
+  hg: parse error: invalid date: 'Apr 2018'
+  hg: parse error: invalid date: 'Jun 2018'
+  hg: parse error: invalid date: 'Sep 2018'
+  hg: parse error: invalid date: 'Nov 2018'
```

Differential Revision: https://phab.mercurial-scm.org/D2289

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