Use caret operator in composer.json

Plus be verbose about first supported version.

https://getcomposer.org/doc/articles/versions.md#caret

composer.json

@@ -32,10 +32,10 @@
         "php": ">=5.6.0",
         "ext-intl": "*",
         "ext-mbstring": "*",
-        "cakephp/chronos": "~1.0",
+        "cakephp/chronos": "^1.0.0",
         "aura/intl": "^3.0.0",
-        "psr/log": "^1.0",
-        "zendframework/zend-diactoros": "^1.4"
+        "psr/log": "^1.0.0",
+        "zendframework/zend-diactoros": "^1.4.0"
     },
     "suggest": {
         "ext-openssl": "To use Security::encrypt() or have secure CSRF token generation.",