Bump sqlalchemy from 1.3.5 to 1.3.8

Bumps [sqlalchemy](https://github.com/sqlalchemy/sqlalchemy) from 1.3.5 to 1.3.8.
- [Release notes](https://github.com/sqlalchemy/sqlalchemy/releases)
- [Changelog](https://github.com/sqlalchemy/sqlalchemy/blob/master/CHANGES)
- [Commits](https://github.com/sqlalchemy/sqlalchemy/commits)

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

Pipfile.lock

@@ -381,10 +381,10 @@
         },
         "sqlalchemy": {
             "hashes": [
-                "sha256:c30925d60af95443458ebd7525daf791f55762b106049ae71e18f8dd58084c2f"
+                "sha256:2f8ff566a4d3a92246d367f2e9cd6ed3edeef670dcd6dda6dfdc9efed88bcd80"
             ],
             "index": "pypi",
-            "version": "==1.3.5"
+            "version": "==1.3.8"
         },
         "twitter": {
             "hashes": [

requirements.txt

@@ -37,7 +37,7 @@ raven==6.10.0
 redis==3.2.1
 requests==2.22.0
 six==1.12.0
-sqlalchemy==1.3.5
+sqlalchemy==1.3.8
 twitter==1.18.0
 urllib3==1.25.3
 vine==1.3.0