travis: Added another exclude.

.travis.yml

@@ -13,7 +13,7 @@ script:
     - time ./neofetch --ascii --config config/travis.conf -v
     # See this wiki page for why we're disabling these errors.
     # https://github.com/dylanaraps/neofetch/wiki/Shellcheck-Exclusions
-    - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then shellcheck neofetch -e SC1090,SC2009,SC2012,SC2016,SC2034,SC2128,SC2153,SC2154,SC2178,SC2010,SC1004,SC1117; fi
+    - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then shellcheck neofetch -e SC1090,SC2009,SC2012,SC2016,SC2034,SC2128,SC2153,SC2154,SC2178,SC2010,SC1004,SC1091,SC1117; fi
     # The if statement is here to invert the exit code from grep.
     # grep normally errors if no match is found but we want the opposite.
     # We invert it so grep fails if a match is found.