Add documentation about transactions not working.

Fixes #305

Author: mikebronner

README.md

@@ -67,6 +67,7 @@ The following items currently do no work with this package:
 ```diff
 - caching of lazy-loaded relationships, see #127. Currently lazy-loaded belongs-to relationships are cached. Caching of other relationships is in the works.
 - using select() clauses in Eloquent queries, see #238 (work-around discussed in the issue)
+- using transactions. If you are using transactions, you will likely have to manually flush the cache, see [issue #305](https://github.com/GeneaLabs/laravel-model-caching/issues/305).
 ```
 
 [![installation guide cover](https://user-images.githubusercontent.com/1791050/36356190-fc1982b2-14a2-11e8-85ed-06f8e3b57ae8.png)](https://vimeo.com/256318402)

composer.json

@@ -20,16 +20,16 @@
     },
     "require-dev": {
         "fzaninotto/faker": "^1.4",
-        "mockery/mockery": "*",
+        "mockery/mockery": "^1.3",
         "orchestra/testbench-browser-kit": "^4.0",
         "orchestra/testbench": "^4.0",
-        "php-coveralls/php-coveralls" : "*",
-        "phpmd/phpmd": "*",
+        "php-coveralls/php-coveralls" : "^2.2",
+        "phpmd/phpmd": "^2.7",
         "phpunit/phpunit": "^8.0",
-        "predis/predis": "*",
-        "sebastian/phpcpd": "*",
+        "predis/predis": "^1.1",
+        "sebastian/phpcpd": "^4.1",
         "squizlabs/php_codesniffer": "^3.4",
-        "symfony/thanks": "*"
+        "symfony/thanks": "^1.2"
     },
     "autoload": {
         "psr-4": {