fix: build issue. Fixes #685 (?)

mweststrate · mweststrate · commit 9007be0a68e8 · 2020-10-21T00:52:43.000+01:00
diff --git a/src/core/proxy.ts b/src/core/proxy.ts
@@ -18,7 +18,6 @@ import {
 	ProxyTypeProxyObject,
 	ProxyTypeProxyArray
 } from "../internal"
-import {isDraft} from "../utils/common"
 
 interface ProxyBaseState extends ImmerBaseState {
 	assigned_: {
