feat(Composer) fix conflicts and then commit the result.

.github/workflows/phpunit.yml

@@ -10,8 +10,6 @@ jobs:
       max-parallel: 4
       matrix:
         include:
-            - php: '5.6'
-              phpseclib: '^2.0'
             - php: '7.0'
               phpseclib: '^2.0'
             - php: '7.1'

appveyor.yml

@@ -9,8 +9,6 @@ image: Visual Studio 2017
 ## Build matrix for lowest and highest possible targets
 environment:
   matrix:
-  - dependencies: lowest
-    PHP_VERSION: 5.6
   - dependencies: lowest
     PHP_VERSION: 7.0
   - dependencies: current

composer.json

@@ -29,14 +29,14 @@
         }
     ],
     "require": {
-        "php": ">=5.6.3,<8.0",
+        "php": ">=7.0",
         "ext-sockets": "*",
         "ext-mbstring": "*",
         "phpseclib/phpseclib": "^2.0|^3.0"
     },
     "require-dev": {
         "ext-curl": "*",
-        "phpunit/phpunit": "^5.7|^6.5|^7.0",
+        "phpunit/phpunit": "^6.5|^7.5",
         "squizlabs/php_codesniffer": "^3.5",
         "nategood/httpful": "^0.2.20"
     },

docker/php/Dockerfile

@@ -1,4 +1,4 @@
-FROM php:5.6-cli
+FROM php:7.0-cli
 
 RUN apt update && \
     apt -qy install git unzip zlib1g-dev && \