apt? is that a threat?

appveyor-linux.yml

@@ -6,8 +6,8 @@ environment:
 
 install:
   - sudo add-apt-repository ppa:haxe/releases -y
-  - sudo apt-get update
-  - sudo apt-get install haxe-4.1.5 -y
+  - sudo apt update
+  - sudo apt install haxe=4.1.5 -y
   - mkdir $HAXELIB_ROOT && haxelib setup $HAXELIB_ROOT
   - haxelib install lime 7.9.0
   - haxelib install openfl