Add verbose make test run

To try to get more info on travis's Linux sickness

.travis.yml

@@ -24,6 +24,7 @@ addons:
 script:
     - perl Configure.pl $RAKUDO_OPTIONS --moar-option=--cc=$(command -v gcc-6 >/dev/null 2>&1; if [ $? -eq 1 ]; then printf "gcc"; else printf "gcc-6"; fi)
     - "make test"
+    - prove -e './perl6 -Ilib' -vlr t
     - "make install"
 
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