pw_env_setup: PyPI version bump to 0.0.19

Change-Id: I2ba0b4478aee19677c0839a0c22b21ded3341fe7
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/239433
Reviewed-by: Rob Mohr <mohrr@google.com>
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pw_env_setup/pypi_common_setup.cfg

@@ -13,7 +13,7 @@
 # the License.
 [metadata]
 name = pigweed
-version = 0.0.18
+version = 0.0.19
 author = Pigweed Authors
 author_email = pigweed-developers@googlegroups.com
 description = Pigweed Python modules