Update tox build with latest versions

Versions checked are:
 - redis
 - aiohttp
 - psycopg2
 - gevent
 - requests
 - sqlalchemy

Added new versions when latest is not tested.

Author: Stefan Tjarks

tox.ini

@@ -77,6 +77,7 @@ deps =
     aiohttp20: aiohttp>=2.0,<2.1
     aiohttp21: aiohttp>=2.1,<2.2
     aiohttp22: aiohttp>=2.2,<2.3
+    aiohttp23: aiohttp>=2.3,<2.4
     tornado40: tornado>=4.0,<4.1
     tornado41: tornado>=4.1,<4.2
     tornado42: tornado>=4.2,<4.3
@@ -85,6 +86,7 @@ deps =
     futures: futures>=3.0,<3.1
     aiohttp_jinja012: aiohttp_jinja2>=0.12,<0.13
     aiohttp_jinja013: aiohttp_jinja2>=0.13,<0.14
+    aiohttp_jinja014: aiohttp_jinja2>=0.14,<0.15
     blinker: blinker
     boto: boto
     boto: moto<1.0
@@ -175,8 +177,11 @@ deps =
     requests212: requests-mock>=1.3
     requests213: requests>=2.13,<2.14
     requests213: requests-mock>=1.3
+    requests218: requests>=2.18,<2.18
+    requests218: requests-mock>=1.4
     sqlalchemy10: sqlalchemy>=1.0,<1.1
-    sqlalchemy11: sqlalchemy==1.1.0b3
+    sqlalchemy11: sqlalchemy>=1.1,<1.2
+    sqlalchemy12: sqlalchemy>=1.2,<1.3
     webtest: WebTest
 
 # pass along test env variables