Remove unneeded webhook notification

.travis.yml

@@ -27,6 +27,3 @@ script:
   - cd ../io-surface
   - cargo build --verbose
   - cargo test --verbose -- --nocapture
-
-notifications:
-  webhooks: http://build.servo.org:54856/travis

cocoa/.travis.yml

@@ -1,6 +1,3 @@
 os: osx
 
 language: rust
-
-notifications:
-  webhooks: http://build.servo.org:54856/travis

core-graphics/.travis.yml

@@ -8,6 +8,3 @@ rust:
 script:
   - cargo test
   - cargo test --features="elcapitan"
-
-notifications:
-  webhooks: http://build.servo.org:54856/travis

core-text/.travis.yml

@@ -4,5 +4,3 @@ rust:
   - beta
   - stable
 os: osx
-notifications:
-  webhooks: http://build.servo.org:54856/travis

io-surface/.travis.yml

@@ -8,5 +8,3 @@ rust:
 branches:
   except:
     - master
-notifications:
-  webhooks: http://build.servo.org:54856/travis