Drop PHP5 (#518)

* drop PHP5

* Added branch alias

.travis.yml

@@ -7,11 +7,14 @@ cache:
         - $HOME/.composer/cache/files
 
 php:
-  - 5.5
-  - 5.6
-  - 7.0
   - 7.1
   - 7.2
+  - 7.3
+
+branches:
+  except:
+    - /^analysis-.*$/
+    - /^patch-.*$/
 
 env:
   - TEST_COMMAND="composer test-all"
@@ -19,10 +22,8 @@ env:
 matrix:
     fast_finish: true
     include:
-        - php: 5.5
+        - php: 7.1
           env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest" PREFER_COVERAGE=true
-        - php: hhvm
-          dist: trusty
 
 install:
     - travis_retry composer update ${COMPOSER_FLAGS} --prefer-source --no-interaction
@@ -33,6 +34,7 @@ before_script:
   - if [[ "$PREFER_COVERAGE" = true ]] && [[ "$TRAVIS_PULL_REQUEST" = false ]]; then TEST_COMMAND="composer test-coverage" COVERAGE=true; fi
 
 script:
+  - composer validate --strict --no-check-lock
   - echo $TEST_COMMAND
   - $TEST_COMMAND
 

composer.json

@@ -2,17 +2,17 @@
     "name": "mailgun/mailgun-php",
     "description": "The Mailgun SDK provides methods for all API functions.",
     "require": {
-        "php": "^5.5 || ^7.0",
+        "php": "^7.1",
         "php-http/httplug": "^1.0 || ^2.0",
         "php-http/multipart-stream-builder": "^1.0",
-        "php-http/client-common": "^1.1",
+        "php-http/client-common": "^1.9",
         "php-http/discovery": "^1.0",
         "webmozart/assert": "^1.2"
     },
     "require-dev": {
         "phpunit/phpunit": "~4.8",
         "php-http/guzzle6-adapter": "^1.0",
-        "guzzlehttp/psr7": "^1.4",
+        "nyholm/psr7": "^1.0",
         "nyholm/nsa": "^1.1"
     },
     "autoload": {
@@ -41,5 +41,10 @@
         "test-all": "vendor/bin/phpunit --testsuite all",
         "test-integration": "vendor/bin/phpunit --testsuite integration",
         "test-coverage": "vendor/bin/phpunit --testsuite all --coverage-text --coverage-clover=build/coverage.xml"
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "3.0-dev"
+        }
     }
 }