Flesh out Subscriable type to better match ES Observable spec

types/recompose/index.d.ts

@@ -16,8 +16,18 @@ declare module 'recompose' {
     type mapper<TInner, TOutter> = (input: TInner) => TOutter;
     type predicate<T> = mapper<T, boolean>;
     type predicateDiff<T> = (current: T, next: T) => boolean
+    interface Observer<T> {
+        next(value: T): void;
+        error(err: any): void;
+        complete(): void;
+    }
+
+    interface Subscription {
+        unsubscribe(): void;
+        closed: boolean;
+    }
     interface Subscribable<T> {
-        subscribe: Function;
+        subscribe(observer: Observer<T>):Subscription;
     }
 
     interface ComponentEnhancer<TInner, TOutter> {