Define upper bound for dependency to not install all future versions by default byt only compatible ones

Author: OndraM

README.md

@@ -17,7 +17,7 @@ or
 ```
 {
     "require": {
-        "recombee/php-api-client": ">=1.3"
+        "recombee/php-api-client": "^1.3"
     }
 }
 ```

composer.json

@@ -11,7 +11,7 @@
     ],
     "require": {
       "php": ">=5.4.0",
-      "rmccue/requests": ">=1.7"
+      "rmccue/requests": "^1.7.1"
     },
     "require-dev": {
         "phpunit/phpunit": ">=4",