Change requests version to 2.21.0

Github identified version 2.18 as a security issue, so I've advanced the version number here.
NREL · Jan 29, 2019 · d35a3bd · d35a3bd
1 parent 39e017c
commit d35a3bd
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/requirements.txt b/requirements.txt
@@ -13,4 +13,4 @@ pytest-cov==2.5.1
 scikit_learn==0.18.1
 matplotlib==2.1.0
 eia-python==1.22
-requests==2.18.4
+requests==2.21.0