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travis: Run "gem install" without sudo

Running "sudo gem install" was causing random errors like the following:

ERROR:  While executing gem ... (Errno::EACCES)
    Permission denied @ rb_sysopen - /home/travis/.rvm/gems/ruby-2.4.1/cache/asciidoctor-1.5.6.2.gem

Perhaps sudo is no longer necessary, even on OS X?  :-)

--- a/.travis.yml

+++ b/.travis.yml

@@ -1,5 +1,5 @@

 language: go

-sudo: required

+sudo: false

 dist: trusty

 go:

   - 1.9.4

@@ -21,5 +21,7 @@

   - ./hugo -s docs/

   - ./hugo --renderToMemory -s docs/

 before_install:

-  # gem install must be run with sudo on OSX

-  - sudo gem install asciidoctor | gem install asciidoctor

+  - which asciidoctor || true

+  - gem install asciidoctor

+  - which asciidoctor || true

+  - type asciidoctor || true