Change language in Travis configuration to shell

Mark-Simulacrum · alexcrichton · commit 9e96c9cc1106 · 2017-07-13T13:31:12.000-07:00
In theory, this will give us more disk space to work with and unblock the queue.
diff --git a/.travis.yml b/.travis.yml
@@ -1,4 +1,4 @@
-language: generic
+language: shell
 sudo: required
 dist: trusty
 services:
