CI: Update travis matrix to test on curl-client v2.

This will blacklist the curl-client v1 installation since there is no way to detect which version is installed and adapt the Factory based on that information.

Author: shulard

.travis.yml

@@ -38,11 +38,11 @@ matrix:
 
           # Test with httplug 1.x clients
         - php: 7.2
-          env: DEPENDENCIES="php-http/buzz-adapter:^1.0 php-http/curl-client:^1.0 php-http/guzzle6-adapter:^1.1.1 php-http/react-adapter:^0.2.1 php-http/socket-client:^1.0"
+          env: DEPENDENCIES="php-http/buzz-adapter:^1.0 php-http/guzzle6-adapter:^1.1.1 php-http/react-adapter:^0.2.1 php-http/socket-client:^1.0"
 
           # Test with httplug 2.x clients
         - php: 7.2
-          env: DEPENDENCIES="php-http/guzzle6-adapter:^2.0.1"
+          env: DEPENDENCIES="php-http/guzzle6-adapter:^2.0.1 php-http/curl-client:^2.0.0"
 
           # Latest commit to master
         - php: 7.3

composer.json

@@ -42,7 +42,8 @@
         "symfony/options-resolver": "^3.4.20 || ^4.0.15 || ^4.1.9 || ^4.2.1"
     },
     "conflict": {
-        "php-http/guzzle6-adapter": "<1.1"
+        "php-http/guzzle6-adapter": "<1.1",
+        "php-http/curl-client": "<2.0"
     },
     "require-dev": {
         "guzzlehttp/psr7": "^1.0",