Removing `return` from reflow implementations

I don't think it will be necessary to wait for components to complete
re-rendering before moving on with the reflow process. Parent components
only depend on the bounding box and that is determined immediately when
reflow is called

src/components/SVG/Box.js

@@ -25,7 +25,7 @@ class Box extends React.PureComponent {
       axisX2: useAnchors ? box.axisX2 + padding : box.width + 2 * padding
     });
 
-    return this.setStateAsync({
+    this.setStateAsync({
       width: this.getBBox().width,
       height: box.height + 2 * padding,
       contentTransform: `translate(${ padding } ${ padding + labelBox.height })`,

src/components/SVG/Image.js

@@ -35,7 +35,7 @@ class Image extends React.PureComponent {
     const { padding } = this.props;
     const box = this.children[0].getBBox();
 
-    return this.setStateAsync({
+    this.setStateAsync({
       width: Math.round(box.width + 2 * padding),
       height: Math.round(box.height + 2 * padding)
     });

src/components/SVG/Loop.js

@@ -93,7 +93,7 @@ class Loop extends React.PureComponent {
     box.offsetX = this.contentOffset.x;
     box.offsetY = this.contentOffset.y;
 
-    return this.setStateAsync({
+    this.setStateAsync({
       labelTransform: `translate(${ this.getBBox().width - labelBox.width - 10 } ${ this.getBBox().height + 2 })`,
       loopPaths: [
         skip && skipPath(box, greedy),

src/components/SVG/Pin.js

@@ -14,7 +14,7 @@ class Pin extends React.PureComponent {
   reflow() {
     const { radius } = this.props;
 
-    return this.setBBox({
+    this.setBBox({
       width: radius * 2,
       height: radius * 2
     });

src/components/SVG/Text.js

@@ -15,7 +15,7 @@ class Text extends React.PureComponent {
       height: box.height
     });
 
-    return this.setStateAsync({
+    this.setStateAsync({
       transform: `translate(${-box.x} ${-box.y})`
     });
   }

src/components/SVG/VerticalLayout.js

@@ -96,7 +96,7 @@ class VerticalLayout extends React.PureComponent {
       offset += spacing + box.height;
     });
 
-    return this.setStateAsync({
+    this.setStateAsync({
       childTransforms: this.updateChildTransforms(childBoxes),
       connectorPaths: withConnectors ? [
         ...childBoxes.map(box => this.makeCurve(box)),