diff --git a/README.md b/README.md
index 06c6325..ccf06e1 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,8 @@ composer require "fab2s/filelock"
 
 `FileLock` is also included in [OpinHelper](https://github.com/fab2s/OpinHelpers) which packages several bellow "Swiss Army Knife" level Helpers covering some of the most annoying aspects of php programing, such as UTF8 string manipulation, high precision Mathematics or properly locking a file
 
+Should you need to work with php bellow 7.1, you can still use [OpinHelper](https://github.com/fab2s/OpinHelpers) `0.x`
+
 ## Prerequisites
 
 `FileLock` has no specific dependencies 
diff --git a/composer.json b/composer.json
index 812a9ef..29e1450 100644
--- a/composer.json
+++ b/composer.json
@@ -32,5 +32,13 @@
         "psr-4": {
             "fab2s\\Tests\\": "tests/"
         }
+    },
+    "scripts": {
+        "post-update-cmd": [
+            "rm -f .*.cache"
+        ],
+        "post-install-cmd": [
+            "rm -f .*.cache"
+        ]
     }
 }
diff --git a/tests/FileLockTest.php b/tests/FileLockTest.php
index 75acc62..7b00c38 100644
--- a/tests/FileLockTest.php
+++ b/tests/FileLockTest.php
@@ -67,7 +67,7 @@ public function testLock(string $lockMethod, string $lockCall)
     /**
      * @return array
      */
-    public function lockMethodCases()
+    public function lockMethodCases(): array
     {
         return [
             [