Replace panda with zef

Author: moznion

.travis.yml

@@ -2,9 +2,8 @@ language: perl6
 perl6:
   - latest
 install:
-  - rakudobrew build-panda
-  - panda --notests installdeps .
+  - rakudobrew build-zef
+  - zef install --/test --depsonly .
 script:
-  - perl6 -MPanda::Builder -e 'Panda::Builder.build($*CWD)'
-  - PERL6LIB=$PWD/blib/lib prove -e perl6 -r t/
+  - zef test .
 sudo: false