Remove apt-get update from example travis file

Just doing an apt-get update doesn't update the base OS so it's not clear what the value of this line is, but it does add time to travis build.
baszalmstra · May 14, 2020 · b681738 · b681738
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commit b681738
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diff --git a/docs/source/user-guide/tasks/use-conda-with-travis-ci.rst b/docs/source/user-guide/tasks/use-conda-with-travis-ci.rst
@@ -37,7 +37,6 @@ project that supports Python 2.7, 3.5, and 3.6:
      - "3.5"
      - "3.6"
    install:
-     - sudo apt-get update
      # We do this conditionally because it saves us some downloading if the
      # version is the same.
      - if [[ "$TRAVIS_PYTHON_VERSION" == "2.7" ]]; then