Trigger docs update only for changes in master

See also: https://docs.travis-ci.com/user/environment-variables/#Default-Environment-Variables

.gitattributes

@@ -3,7 +3,6 @@
 
 * text=auto
 
-
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
 # Exclude the following files from GitHub's language statistics

.travis/check-links.sh

@@ -1,15 +1,17 @@
 #!/bin/bash
 
-cd "$(dirname "${BASH_SOURCE[0]}")/.."
+cd "$(dirname "${BASH_SOURCE[0]}")/.." \
+    || exit 1
 
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
 find . -name "*.md" \
        -not -path "./node_modules/*" \
        -not -path "./dist/*" \
        -not -path "./coverage/*" \
-    | xargs awesome_bot \
-        --allow-dupe \
-        --allow-redirect \
-        --set-timeout 150 \
-        --white-list "example1.com,example2.com,example3.com"
+       -exec awesome_bot \
+                --allow-dupe \
+                --allow-redirect \
+                --set-timeout 150 \
+                --white-list "example1.com,example2.com,example3.com" \
+                {} +

.travis/trigger-site-docs-build.sh

@@ -1,9 +1,20 @@
 #!/bin/bash
 
-cd "$(dirname "${BASH_SOURCE[0]}")/.."
+cd "$(dirname "${BASH_SOURCE[0]}")/.." \
+    || exit 1
 
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
+# Only execute the following if the commit:
+#
+#   * doesn't come from a pull request
+#   * is made to the `master` branch
+
+if [ "$TRAVIS_PULL_REQUEST" = "true" ] ||
+   [ "$TRAVIS_BRANCH" != "master" ]; then
+    exit 0
+fi
+
 # If something changed in `docs/` in the last 3 commits, trigger
 # an update of the documentation in the repository of the website.