fix: add margin between button (#62)

* fix: add margin between button

* chore: bump margin one size up

src/containers/ReviewActions/__snapshots__/index.test.jsx.snap

@@ -38,7 +38,7 @@ exports[`ReviewActions component component snapshot: do not show rubric 1`] = `
     >
       <Button
         onClick={[MockFunction this.props.toggleShowRubric]}
-        variant="outline-primary"
+        variant="outline-primary mr-2"
       >
         <FormattedMessage
           defaultMessage="Show Rubric"
@@ -121,7 +121,7 @@ exports[`ReviewActions component component snapshot: show rubric, no score 1`] =
     >
       <Button
         onClick={[MockFunction this.props.toggleShowRubric]}
-        variant="outline-primary"
+        variant="outline-primary mr-2"
       >
         <FormattedMessage
           defaultMessage="Hide Rubric"

src/containers/ReviewActions/index.jsx

@@ -42,7 +42,7 @@ export const ReviewActions = ({
       <div className="review-actions-group">
         {isLoaded && (
           <>
-            <Button variant="outline-primary" onClick={toggleShowRubric}>
+            <Button variant="outline-primary mr-2" onClick={toggleShowRubric}>
               <FormattedMessage {...(showRubric ? messages.hideRubric : messages.showRubric)} />
             </Button>
             <StartGradingButton />