Update babel from 2.5.0 to 2.5.1

requirements/docs.txt

@@ -15,9 +15,9 @@ alabaster==0.7.10 \
     --hash=sha256:2eef172f44e8d301d25aff8068fddd65f767a3f04b5f15b0f4922f113aa1c732 \
     --hash=sha256:37cdcb9e9954ed60912ebc1ca12a9d12178c26637abdf124e3cde2341c257fe0
 # babel is required by Sphinx, django-babel, puente
-Babel==2.5.0 \
-    --hash=sha256:e0d07af61ff43729f61dc838f2af283c315e671454e7cf9d744ac9c56cccfca6 \
-    --hash=sha256:754177ee7481b6fac1bf84edeeb6338ab51640984e97e4083657d384b1c8830d
+Babel==2.5.1 \
+    --hash=sha256:f20b2acd44f587988ff185d8949c3e208b4b3d5d20fcab7d91fe481ffa435528 \
+    --hash=sha256:6007daf714d0cd5524bbe436e2d42b3c20e68da66289559341e48d2cd6d25811
 # docutils is required by Sphinx
 docutils==0.14 \
     --hash=sha256:7a4bd47eaf6596e1295ecb11361139febe29b084a87bf005bf899f9a42edc3c6 \