Try being more parallel on travis

This was previously set as travis would frequently fail to spawn a new process
due to resource limits being hit, but now that we're using `sudo: false` it's
looking like that infrastructure is more robust and we may be able to run tests
in parallel.

diff --git a/.travis.yml b/.travis.yml
index 491f011411dc58f6efc37f98aae65523b57a4e93..ac0abad5fadc2c4c2ac735da3efd09f4f6c2995c 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -22,7 +22,6 @@ after_success: |
 env:
   global:
     - secure: scGpeetUfba5RWyuS4yt10bPoFAI9wpHEReIFqEx7eH5vr2Anajk6+70jW6GdrWVdUvdINiArlQ3An2DeB9vEUWcBjw8WvuPtOH0tDMoSsuVloPlFD8yn1Ac0Bx9getAO5ofxqtoNg+OV4MDVuGabEesqAOWqURNrBC7XK+ntC8=
-    - RUST_TEST_THREADS=1
 
 os:
   - linux