Travis CI: temporary disable Fedora 25

tarantool-php is not ready yet.

Author: rtsisyk

.travis.yml

@@ -22,7 +22,7 @@ env:
     - OS=el DIST=6
     - OS=el DIST=7
     - OS=fedora DIST=24
-    - OS=fedora DIST=25
+#    - OS=fedora DIST=25
     - OS=ubuntu DIST=trusty
     - OS=ubuntu DIST=precise
 #    phpize is, currently, broken on xenial. can't test, still not stable