Set up 3.7 branch

.travis.yml

@@ -4,7 +4,7 @@ dist: trusty
 
 env:
   global:
-    - COMPOSER_ROOT_VERSION="3.0.x-dev"
+    - COMPOSER_ROOT_VERSION="3.7.x-dev"
 
 matrix:
   include:
@@ -17,7 +17,7 @@ matrix:
     - php: 7.3
       env: DB=MYSQL INSTALLER_VERSION=4.4.x-dev PHPUNIT_TEST=1 SUBSITES=1
     - php: 7.3
-      env: DB=MYSQL INSTALLER_VERSION=4.x-dev PHPUNIT_TEST=1
+      env: DB=MYSQL INSTALLER_VERSION=4.6.x-dev PHPUNIT_TEST=1
 
 before_script:
   - phpenv rehash

composer.json

@@ -42,11 +42,6 @@
     "bin": [
         "bin/fulltextsearch_quickstart"
     ],
-    "extra": {
-        "branch-alias": {
-            "3.x-dev": "3.7.x-dev"
-        }
-    },
     "scripts": {
         "lint": "phpcs -s src/ tests/",
         "lint-clean": "phpcbf src/ tests/"