Remove the fuchsia builder

I believe everything was renamed anyway, so beta is broken regardless

Author: alexcrichton

.travis.yml

@@ -97,7 +97,6 @@ matrix:
     - env: IMAGE=dist-arm-linux DEPLOY=1
     - env: IMAGE=dist-armhf-linux DEPLOY=1
     - env: IMAGE=dist-armv7-linux DEPLOY=1
-    - env: IMAGE=dist-fuchsia DEPLOY=1
     - env: IMAGE=dist-i586-gnu-i686-musl DEPLOY=1
     - env: IMAGE=dist-i686-freebsd DEPLOY=1
     - env: IMAGE=dist-i686-linux DEPLOY=1