try to fix escaping

.travis.yml

@@ -9,10 +9,11 @@ branches:
     - /^3\.\d{2}$/
     - 'master'
 before_install:
+  - mkdir ~/netdisco-mibs
+  - cd ~/netdisco-mibs
   - >
-    mkdir ~/netdisco-mibs && cd ~/netdisco-mibs &&
     curl -sL https://api.github.com/repos/netdisco/netdisco-mibs/tags |
-      jq '.[]|.tarball_url|select(test("tarball/\\d+\\.\\d+$"))' |
+      jq '.[]|.tarball_url|select(test("tarball/\\\\d+\\\\.\\\\d+$"))' |
       sort -rg | head -n1 | xargs -n1 curl -sL | tar --strip-components=1 -zxf -
   - >
     cpanm --quiet --notest PkgConfig Test::CChecker