Travis: purge CloudFlare cache after deployment (#63)

.travis.yml

@@ -6,6 +6,10 @@ env:
   global:
     - BUILD_WEB=/tmp/build-web
     - secure: dMquVRuM4Wi/N3oZJaNIWSW5mpehxVuzDiDnC51OwfMtdNfdyWV7qKJQY44MjbveuyQd7eA/AuTLE+loaAFxiRfBXl2yI5NkAOrJwbbDyw/lAN9Og2FmNi+QLaTsNhpbYZ4zaUNEEqRWs9gIajGaXcWdO/HNYiKHHrk7+XXNDeM=
+    # CLOUDFLARE_AUTH_EMAIL/CLOUDFLARE_AUTH_KEY
+    - secure: JYKSA0crhIfgE7l51aF+qYr4JERLU3hXWRzKSmwuBi4uZzNxWfAm1hQ8qJ4+TTIIjJpr4dceVLdXRZDvX5B83hP8W4m4eoRp98IqwLinS5plB86Kv/C53vYGaMIaE+3u0EdehRgpSIN+2qmAUTNoQkFZsZh1Ok4vaN3QZaE2+f8=
+    # CLOUDFLARE_ZONE
+    - secure: LYV3F3ink6p8XfR2rjCcYDfTDSK22QRU4kYK4e77t42e3zky/tbiNZcJsrq9J5FwNEBZXDLxuXsgeEza3+x6N0uxjBIdopuEullL5jf5WRISxUja2wplOgCa8RC8CIvWyZOsbtw8UWJvbCyjwUXPT8q9sUT1U+KhYSuqVMo32GI=
 addons:
   apt:
     packages:
@@ -88,4 +92,11 @@ after_success:
       git commit -m "Update from Travis for awesome-www@${commit_hash}"
       git --no-pager show --stat
       git push origin "$(git symbolic-ref --quiet HEAD)" 2>&1 | sed "s/$GH_APIDOC_TOKEN/GH_APIDOC_TOKEN/g"
+
+      # Purge CloudFlare cache.
+      curl -X DELETE "https://api.cloudflare.com/client/v4/zones/$CLOUDFLARE_ZONE/purge_cache" \
+        -H "X-Auth-Email: $CLOUDFLARE_AUTH_EMAIL" \
+        -H "X-Auth-Key: $CLOUDFLARE_AUTH_KEY" \
+        -H "Content-Type: application/json" \
+        --data '{"purge_everything":true}'
     fi