Run Windows build only once, it's too slow

.travis.yml

@@ -101,42 +101,6 @@ jobs:
       script:
         - vendor/bin/phing tests
         - vendor/bin/phing phpstan
-    - stage: test
-      os: windows
-      language: shell # No PHP currently
-      env: PHP_VERSION=7.2.23
-      install:
-        - choco install php --version=${PHP_VERSION} --package-parameters="/InstallDir:c:\tools\php"
-        - choco install composer --ia "/DEV=C:\tools\php"
-        - cp 'C:\tools\php\php.ini-production' 'C:\tools\php\php.ini'
-        - echo 'memory_limit=1G' >> 'C:\tools\php\php.ini'
-        - echo 'date.timezone="UTC"' >> 'C:\tools\php\php.ini'
-        - echo 'extension_dir=ext' >> 'C:\tools\php\php.ini'
-        - echo 'extension=php_curl.dll' >> 'C:\tools\php\php.ini'
-        - echo 'extension=php_mbstring.dll' >> 'C:\tools\php\php.ini'
-        - echo 'extension=php_openssl.dll' >> 'C:\tools\php\php.ini'
-        - export PATH=/c/tools/php:$PATH
-      script:
-        - vendor/bin/phing tests
-        - vendor/bin/phing phpstan
-    - stage: test
-      os: windows
-      language: shell # No PHP currently
-      env: PHP_VERSION=7.3.10
-      install:
-        - choco install php --version=${PHP_VERSION} --package-parameters="/InstallDir:c:\tools\php"
-        - choco install composer --ia "/DEV=C:\tools\php"
-        - cp 'C:\tools\php\php.ini-production' 'C:\tools\php\php.ini'
-        - echo 'memory_limit=1G' >> 'C:\tools\php\php.ini'
-        - echo 'date.timezone="UTC"' >> 'C:\tools\php\php.ini'
-        - echo 'extension_dir=ext' >> 'C:\tools\php\php.ini'
-        - echo 'extension=php_curl.dll' >> 'C:\tools\php\php.ini'
-        - echo 'extension=php_mbstring.dll' >> 'C:\tools\php\php.ini'
-        - echo 'extension=php_openssl.dll' >> 'C:\tools\php\php.ini'
-        - export PATH=/c/tools/php:$PATH
-      script:
-        - vendor/bin/phing tests
-        - vendor/bin/phing phpstan
 
 cache:
   directories: