fix possible memory leak in ColumnResizer (#82)

Author: nihgwu

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## NEXT VERSION
 
+- fix: fix possible memory leak in `ColumnResizer`
+
 ## v1.7.2 (2019-08-26)
 
 - fix: custom renderers should support function component with hooks

src/ColumnResizer.js

@@ -51,11 +51,11 @@ class ColumnResizer extends React.PureComponent {
     this._handleMouseMove = this._handleMouseMove.bind(this);
   }
 
-  componentWillMount() {
+  componentWillUnmount() {
     if (this.handleRef) {
       const { ownerDocument } = this.handleRef;
       ownerDocument.removeEventListener('mousemove', this._handleMouseMove);
-      ownerDocument.addEventListener('mouseup', this._handleMouseUp);
+      ownerDocument.removeEventListener('mouseup', this._handleMouseUp);
       removeUserSelectStyles(ownerDocument);
     }
   }