Fix hook parameters (#472)

Author: kurkle

src/core.js

@@ -57,7 +57,7 @@ export function doZoom(chart, zoom, options = {}, useTransition) {
 
   chart.update(useTransition ? 'zoom' : 'none');
 
-  call(options.onZoom, [chart]);
+  call(options.onZoom, [{chart}]);
 }
 
 export function resetZoom(chart) {
@@ -100,6 +100,6 @@ export function doPan(chart, pan, options = {}, enabledScales) {
 
   chart.update('none');
 
-  call(onPan, [chart]);
+  call(onPan, [{chart}]);
 }
 

src/hammer.js

@@ -77,7 +77,7 @@ function endPinch(chart, state, e) {
   if (state.scale) {
     handlePinch(chart, state, e);
     state.scale = null; // reset
-    call(state.options.zoom.onZoomComplete, [chart]);
+    call(state.options.zoom.onZoomComplete, [{chart}]);
   }
 }
 
@@ -111,7 +111,7 @@ function endPan(chart, state) {
   state.delta = null;
   if (state.panning) {
     setTimeout(() => (state.panning = false), 500);
-    call(state.options.pan.onPanComplete, [chart]);
+    call(state.options.pan.onPanComplete, [{chart}]);
   }
 }