Update .travis.yml

Author: dlfivefifty

.travis.yml

@@ -22,4 +22,4 @@ codecov: true
 # uncomment the following lines to override the default test script
 script:
   - if [[ -a .git/shallow ]]; then git fetch --unshallow; fi
-  - travis_wait 20 julia -e 'Pkg.clone(pwd()); Pkg.build("ApproxFun"); Pkg.test("ApproxFun"; coverage=true)'
+  - travis_wait 20 julia -e 'using Pkg; Pkg.clone(pwd()); Pkg.build("ApproxFun"); Pkg.test("ApproxFun"; coverage=true)'