Update requirements.txt (#4819)

Make sure all packages are updated to the latest stable versions.

frameworks/Python/pyramid/requirements.txt

@@ -1,7 +1,7 @@
-psycopg2==2.7.5
+psycopg2==2.8.2
 gunicorn==19.9.0
-meinheld==0.6.1
-SQLAlchemy==1.0.12
-pyramid==1.6.1
+meinheld==1.0.1
+SQLAlchemy==1.3.4
+pyramid==1.10.4
 pyramid_chameleon==0.3
-greenlet==0.4.14
+greenlet==0.4.15