docs: add note to README about bug #1455 (#1546)

* Update README.md

by going through the documentation , it is not where hinted that we need to place it in separate file. Thus explicitly mentioning it in readme.

* Update README.md

add link to bug

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Co-authored-by: James Monger <jameskmonger@hotmail.co.uk>

README.md

@@ -126,6 +126,8 @@ export interface ThrowableWeapon {
 
 InversifyJS needs to use the type as identifiers at runtime. We use symbols as identifiers but you can also use classes and or string literals.
 
+PLEASE MAKE SURE TO PLACE THIS TYPES DECLARATION IN A SEPARATE FILE. (see bug #1455)
+
 ```ts
 // file types.ts