Update script which triggers RTD build to use new RTD webhook api.

.travis.yml

@@ -34,7 +34,9 @@ matrix:
     - env: ENV=coverage
       python: 2.7
       before_script: TOX_ENV=coverage-travis
-    - env: ENV=docs
+    - env:
+        - ENV=docs
+        - secure: "d4F2RE2iWFh6yqE5MUxnakDihBMsY/hMsaMWllVAYU/fvCMKhaW97d51EiS55kur/eNVX2jpEqkVkSu5VeNSxC3w9sZTG+dHVb8A43o9QaSCPngvHTZ4X9fx8lB96G7uju6pmm5ovKt85hxZW2uQNYo3ugwCUl94lVDYqo+KJUM="
       python: 3.5
       before_script: TOX_ENV=docs-travis
       # Note: graphviz is needed for grapgs embedded in the docs

contrib/trigger_rtd_build.py

@@ -14,11 +14,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import sys
+import os
+
 import requests
 
+token = os.environ['RTD_TOKEN']
 
-key = sys.argv[1]
-url = 'https://readthedocs.org/build/%s' % (key)
-r = requests.post(url)
+url = 'https://readthedocs.org/api/v2/webhook/libcloud/87656/'
+r = requests.post(url, data={'token': token})
 print(r.text)