Update dependencies, particularly pg_query

Gemfile.lock

 GEM
   remote: https://rubygems.org/
   specs:
-    diff-lcs (1.2.5)
-    json (1.8.3)
-    pg_query (0.9.1)
-      json (~> 1.8)
-    rspec (3.2.0)
-      rspec-core (~> 3.2.0)
-      rspec-expectations (~> 3.2.0)
-      rspec-mocks (~> 3.2.0)
-    rspec-core (3.2.3)
-      rspec-support (~> 3.2.0)
-    rspec-expectations (3.2.1)
+    diff-lcs (1.3)
+    json (2.1.0)
+    pg_query (1.0.0)
+      json (>= 1.8, < 3)
+    rspec (3.7.0)
+      rspec-core (~> 3.7.0)
+      rspec-expectations (~> 3.7.0)
+      rspec-mocks (~> 3.7.0)
+    rspec-core (3.7.0)
+      rspec-support (~> 3.7.0)
+    rspec-expectations (3.7.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.2.0)
-    rspec-mocks (3.2.1)
+      rspec-support (~> 3.7.0)
+    rspec-mocks (3.7.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.2.0)
-    rspec-support (3.2.2)
+      rspec-support (~> 3.7.0)
+    rspec-support (3.7.0)
 
 PLATFORMS
   ruby
@@ -27,4 +27,4 @@ DEPENDENCIES
   rspec
 
 BUNDLED WITH
-   1.11.2
+   1.14.6