Fix AppVeyor builds (#82)

* Fix AppVeyor builds

* Install make with chocolatey

* Remove lower 7.1 dep

Author: theofidry

appveyor.yml

@@ -1,7 +1,7 @@
 build: false
 platform:
   - x64
-clone_folder: c:\projects\webmozart\php-scoper
+clone_folder: c:\projects\humbug\php-scoper
 
 branches:
   only:
@@ -13,8 +13,6 @@ environment:
     php_ver_target: 7.0
   - dependencies: highest
     php_ver_target: 7.1
-  - dependencies: lowest
-    php_ver_target: 7.1
 
 cache: # cache is cleared when linked file is modified
     - '%LOCALAPPDATA%\Composer\files -> composer.lock'
@@ -30,6 +28,7 @@ init:
     - SET ANSICON=121x90 (121x90)
 
 install:
+    - ps: choco install make
     - IF EXIST c:\tools\php (SET PHP=0)
     # Enable Windows update service
     - ps: Set-Service wuauserv -StartupType Manual
@@ -46,12 +45,11 @@ install:
     - IF %PHP%==1 echo memory_limit=1G >> php.ini
     # Install composer and update per matrix
     - appveyor-retry appveyor DownloadFile https://getcomposer.org/composer.phar
-    - cd c:\projects\webmozart\php-scoper
-    - IF %dependencies%==lowest appveyor-retry composer update --no-suggest --no-interaction --no-progress --prefer-dist --prefer-lowest
-    - IF %dependencies%==highest appveyor-retry composer update --no-suggest --no-interaction --no-progress --prefer-dist
+    - cd c:\projects\humbug\php-scoper
+    - appveyor-retry composer install --no-suggest --no-interaction --no-progress --prefer-dist
     - composer show
 
 
 test_script:
-    - cd c:\projects\webmozart\php-scoper
+    - cd c:\projects\humbug\php-scoper
     - make tu