Run tests on each Scala version as separate tasks

Author: romac

.larabot.conf

@@ -1,6 +1,12 @@
 commands = [
-  "sbt -batch +test"
-  "sbt -batch +it:test"
+    "sbt -batch ++2.10.7 test"
+    "sbt -batch ++2.11.12 test"
+    "sbt -batch ++2.12.8 test"
+    "sbt -batch ++2.13.0 test"
+    "sbt -batch ++2.10.7 it:test"
+    "sbt -batch ++2.11.12 it:test"
+    "sbt -batch ++2.12.8 it:test"
+    "sbt -batch ++2.13.0 it:test"
 ]
 
 trusted = [