travis-ci: add tarantool-2.3 into CI

Totktonada · Totktonada · commit d674096ead0e · 2019-10-17T21:41:43.000+03:00
diff --git a/.travis.yml b/.travis.yml
@@ -13,6 +13,7 @@ env:
   - TNT_VERSION=1.10
   - TNT_VERSION=2x
   - TNT_VERSION=2.2
+  - TNT_VERSION=2.3
 
 stages:
   - checkstyle
