Further relax containers lower bound

This supports the lowest LTS we test with. This was working before
because the bound was only set on publish and not in source, with it in
source it needs to work for all our tested LTSs.

package.yaml

@@ -56,7 +56,7 @@ executables:
       - aeson >=0.6
       - aeson-pretty
       - bytestring >=0.9.1.4
-      - containers >=0.6.4.1
+      - containers >=0.6.0.1
       - http-conduit >=2.0
       - load-env
       - text >=0.7

yesod-auth-oauth2.cabal

@@ -4,7 +4,7 @@ cabal-version: 1.12
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: e428bd6adf4ff13adcafddd69b8050d4272fa51d127d2c24d6f117dc874b6fc4
+-- hash: 8398e07d0350eca21c712113661776348b39af510ee4559e6e070215c0fe216f
 
 name:           yesod-auth-oauth2
 version:        0.7.0.0
@@ -97,7 +97,7 @@ executable yesod-auth-oauth2-example
     , aeson-pretty
     , base >=4.9.0.0 && <5
     , bytestring >=0.9.1.4
-    , containers >=0.6.4.1
+    , containers >=0.6.0.1
     , http-conduit >=2.0
     , load-env
     , text >=0.7