ENH: update bundled ujson to latest v1.33
BUG: ujson fix for VC++
API: more consistency in the to_datetime return types (give string/array of string inputs) (GH3888)
BUG: truncate will only try to convert to dates for an all_dates index
Merge pull request #3890 from jreback/to_datetime

API: (GH3888) more consistency in the to_datetime return types (given string/array of string inputs)
BUG: (GH3925) Indexing with a string with seconds resolution not selecting from a time index
Merge pull request #3931 from jreback/time_indexing

BUG: (GH3925) partial string selection with seconds resolution
Merge pull request #3921 from jtratner/remove-unused-exceptions

CLN: Remove unused Exceptions
Merge pull request #3946 from Komnomnomnom/ujson-update

ENH: update bundled ujson to latest v1.33
TST: Change network decorator to auto-check for network errors

TST: Enforce more strict rules about ignoring IOErrors with network tests
TST: Remove explicit connectivity checks in test cases.

Instead, network decorator in pandas.util.testing checks
for that instead. You have to opt into failing on tests
by setting `pandas.util.testing._FORCE_NETWORK_ERROR` to `True`.

CLN: Move imports and test skip to top of file
ENH: Allow keyword arguments to network decorator

ENH: skip try/except checks if raise_on_error
ENH: Add test decorator 'with_connectivity_check'.

Allows tests to check that a url is available before bubbling up
an error from a test case.
TST: Change tests to use with_connectivity_check to better approximate previous behavior
DOC: Update RELEASE.rst with info on new/changed decorators
TST: Add check_before_test option to with_connectivity_check.