.travis.yml in ransack-1.8.9 vs .travis.yml in ransack-1.8.10

@@ -5,16 +5,12 @@
 rvm:
   - 2.5
   - 2.2
 
 env:
-  - RAILS=5-2-stable DB=sqlite3
-  - RAILS=5-2-stable DB=mysql
-  - RAILS=5-2-stable DB=postgres
-
-  - RAILS=v5.2.0 DB=sqlite3
-  - RAILS=v5.2.0 DB=mysql
-  - RAILS=v5.2.0 DB=postgres
+  - RAILS=5-1-stable DB=sqlite3
+  - RAILS=5-1-stable DB=mysql
+  - RAILS=5-1-stable DB=postgres
 
   - RAILS=5-0-stable DB=sqlite3
   - RAILS=5-0-stable DB=mysql
   - RAILS=5-0-stable DB=postgres