Trying to resolve some weirdness

Got some weird package conflict crap happening on HHVM. About ready to just dump it but want to give it the ol' college try

.travis.yml

@@ -4,26 +4,27 @@ sudo: required
 
 matrix:
   include:
-    - php: 5.3
-      dist: precise
-    - php: 5.4
-      dist: trusty
-    - php: 5.5
-      dist: trusty
-    - php: 5.6
-      dist: trusty
-    - php: 7.0
-      dist: xenial
-      env: PHPUNIT=5.7
-    - php: 7.1
-    - php: 7.2
-    - php: 7.3
+    # - php: 5.3
+    #   dist: precise
+    # - php: 5.4
+    #   dist: trusty
+    # - php: 5.5
+    #   dist: trusty
+    # - php: 5.6
+    #   dist: trusty
+    # - php: 7.0
+    #   dist: xenial
+    #   env: PHPUNIT=5.7
+    # - php: 7.1
+    # - php: 7.2
+    # - php: 7.3
     - php: hhvm
       dist: xenial
-      env: PHPUNIT=5.7
+      env: HHVM=true PHPUNIT=5.7
 
 install:
   - composer install
+  - if [[ $HHVM == true ]]; then composer require "symphony/yaml:3.0"; fi
   - if [[ $PHPUNIT == 5.7 ]]; then composer require "phpunit/phpunit:5.7"; fi
 
 before_script: