Bump pyrsistent from 0.15.2 to 0.15.3

Bumps [pyrsistent](https://github.com/tobgu/pyrsistent) from 0.15.2 to 0.15.3.
- [Release notes](https://github.com/tobgu/pyrsistent/releases)
- [Changelog](https://github.com/tobgu/pyrsistent/blob/master/CHANGES.txt)
- [Commits](https://github.com/tobgu/pyrsistent/compare/v0.15.2...v0.15.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements/common.txt

@@ -332,5 +332,5 @@ first==2.0.2 \
 attrs==19.1.0 \
     --hash=sha256:69c0dbf2ed392de1cb5ec704444b08a5ef81680a61cb899dc08127123af36a79 \
     --hash=sha256:f0b870f674851ecbfbbbd364d6b5cbdff9dcedbc7f3f5e18a6891057f21fe399
-pyrsistent==0.15.2 \
+pyrsistent==0.15.3 \
-    --hash=sha256:16692ee739d42cf5e39cef8d27649a8c1fdb7aa99887098f1460057c5eb75c3a
+    --hash=sha256:50cffebc87ca91b9d4be2dcc2e479272bcb466b5a0487b6c271f7ddea6917e14