Luke towers patch 1 (#87)

Co-authored-by: Luke Towers <github@luketowers.ca>

Author: bretterer

composer.json

@@ -17,14 +17,14 @@
         "php-http/message": "^1.5",
         "php-http/discovery": "^1.2",
         "php-http/curl-client": "^1.7",
-        "symfony/yaml": "^4.3",
+        "symfony/yaml": "^3.2|^4.3",
         "nesbot/carbon": "^2.0",
         "tightenco/collect": "5.8.31",
         "guzzlehttp/psr7": "^1.4",
         "psr/cache": "^1.0",
         "league/flysystem-memory": "^1.0",
         "cache/filesystem-adapter": "^1.0",
-        "vlucas/phpdotenv": "^4.1",
+        "vlucas/phpdotenv": "^3.3|^4.1",
         "lcobucci/jwt": "^4.0@alpha"
     },
     "require-dev": {