update version constraints in composer.json

Author: fitztrev

composer.json

@@ -20,12 +20,12 @@
         "composer/semver": "^1.4",
         "geerlingguy/ping": "^1.1",
         "illuminate/support": "5.2.*|5.3.*|5.4.*|5.5.*|5.6.*|5.7.*|5.8.*",
-        "vlucas/phpdotenv": "^2.5|^3.3"
+        "vlucas/phpdotenv": "~2.5|~3.3"
     },
     "require-dev": {
         "larapack/dd": "^1.0",
         "mockery/mockery": "^1.0",
-        "orchestra/testbench": "^3.8",
+        "orchestra/testbench": "~3.5|~3.8",
         "phpunit/phpunit": "^7.0",
         "predis/predis": "^1.1",
         "scrutinizer/ocular": "^1.5"