.travis.yml in ransack-1.8.10 vs .travis.yml in ransack-2.0.0

@@ -5,20 +5,29 @@
 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=v5.2.1 DB=sqlite3
+  - RAILS=v5.2.1 DB=mysql
+  - RAILS=v5.2.1 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
 
-  - RAILS=4-2-stable DB=sqlite3
-  - RAILS=4-2-stable DB=mysql
-  - RAILS=4-2-stable DB=postgres
 matrix:
   allow_failures:
     - env: RAILS=5-2-stable DB=sqlite3
     - env: RAILS=5-2-stable DB=mysql
     - env: RAILS=5-2-stable DB=postgres