We can still enable PHP 7.1

.travis.yml

@@ -11,6 +11,11 @@ before_script:
 
 jobs:
   include:
+    - stage: Lint
+      php: 7.1
+      env: DEPENDENCIES=highest
+      script: bin/phing lint
+
     - stage: Lint
       php: 7.2
       env: DEPENDENCIES=highest
@@ -26,6 +31,38 @@ jobs:
       env: DEPENDENCIES=highest
       script: bin/phing lint
 
+    - stage: Tests
+      php: 7.1
+      env: DEPENDENCIES=lowest
+      script: bin/phing tests-without-code-coverage
+
+    - stage: Tests
+      php: 7.1
+      env: DEPENDENCIES=highest
+      script: bin/phing tests-without-code-coverage
+
+    - stage: Tests
+      os: windows
+      dist: 1803-containers
+      language: sh # No PHP currently
+      env: PHP_VERSION=7.1.33 DEPENDENCIES=lowest
+      install:
+        - choco install php --version=${PHP_VERSION} --package-parameters="/InstallDir:c:\tools\php"
+        - choco install composer --ia "/DEV=C:\tools\php"
+        - export PATH=/c/tools/php:$PATH
+      script: bin/phing tests-without-code-coverage
+
+    - stage: Tests
+      os: windows
+      dist: 1803-containers
+      language: sh # No PHP currently
+      env: PHP_VERSION=7.1.33 DEPENDENCIES=highest
+      install:
+        - choco install php --version=${PHP_VERSION} --package-parameters="/InstallDir:c:\tools\php"
+        - choco install composer --ia "/DEV=C:\tools\php"
+        - export PATH=/c/tools/php:$PATH
+      script: bin/phing tests-without-code-coverage
+
     - stage: Tests
       php: 7.2
       env: DEPENDENCIES=lowest

composer.json

@@ -9,7 +9,7 @@
 		"bin-dir": "bin"
 	},
 	"require": {
-		"php": "^7.2",
+		"php": "^7.1",
 		"phpstan/phpdoc-parser": "0.3.5 - 0.4.0",
 		"squizlabs/php_codesniffer": "dev-master"
 	},
@@ -19,7 +19,7 @@
 		"phpstan/phpstan": "0.11.19|^0.12",
 		"phpstan/phpstan-phpunit": "0.11.2|^0.12",
 		"phpstan/phpstan-strict-rules": "0.11.1|^0.12",
-		"phpunit/phpunit": "8.4.3",
+		"phpunit/phpunit": "7.5.17|8.4.3",
 		"dealerdirect/phpcodesniffer-composer-installer": "0.5.0"
 	},
 	"autoload": {