Changed ocramius/package-versions dependancy to composer/package-versions-deprecated to support Composer 2.0 (#260)

* Changed ocaramius/package-versions to composer/package-versions-deprecated to allow composer 2.0 to be used

* Removed coverage.xml

* Removed php 7.1 from travis, as library requires 7.2

Author: footballencarta

.gitignore

@@ -2,4 +2,6 @@
 composer.lock
 vendor
 logs
-.php_cs.cache
+.php_cs.cache
+.phpunit.result.cache
+coverage.xml

.travis.yml

@@ -1,6 +1,5 @@
 language: php
 php:
-  - '7.1'
   - '7.2'
   - '7.3'
   - '7.4'

composer.json

@@ -34,9 +34,9 @@
     "psr/http-client-implementation": "^1.0",
     "laminas/laminas-diactoros": "^1.8.4 || ^2.0",
     "lcobucci/jwt": "^3.2",
-    "ocramius/package-versions": "^1.4",
     "psr/container": "^1.0",
-    "vonage/nexmo-bridge": "^0.1.0"
+    "vonage/nexmo-bridge": "^0.1.0",
+    "composer/package-versions-deprecated": "^1.11"
   },
   "require-dev": {
     "phpunit/phpunit": "^7.4 || ^8.0",