Adds needed module

Author: JJ

shippable.yml

@@ -3,6 +3,7 @@ build:
     - apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 379CE192D401AB61
     - echo "deb http://dl.bintray.com/nxadm/perl6-doc trusty main" | sudo tee -a /etc/apt/sources.list
     - apt-get update && apt-get install rakudo-pkg-for-doc
+    - cpanm TAP::Formatter::JUnit
     - PATH="/opt/rakudo-pkg-for-doc/bin:/opt/rakudo-pkg-for-doc/share/perl6/site/bin:$PATH"
     - P6_DOC_TEST_VERBOSE=1 prove -timer --formatter=TAP::Formatter::JUnit -e perl6 t | tee shippable/testresults/doctests.xml