Update libmozdata from 0.1.52 to 0.1.53 (#280)

requirements.txt

@@ -1,5 +1,5 @@
 pyOpenSSL>=0.14  # Could not find a version that satisfies the requirement pyOpenSSL>=0.14; extra == "security" (from requests[security]>=2.7.0->libmozdata==0.1.43)
-libmozdata==0.1.52
+libmozdata==0.1.53
 numpy==1.16.2
 scipy==1.2.1
 scikit-learn==0.20.3