Remove hardcoded popper placement and get them from popper library (Hacker0x01#1559)

Author: S-t-e-p-s

src/popper_component.jsx

@@ -1,22 +1,9 @@
 import classnames from "classnames";
 import React from "react";
 import PropTypes from "prop-types";
-import { Manager, Reference, Popper } from "react-popper";
+import { Manager, Reference, Popper, placements } from "react-popper";
 
-export const popperPlacementPositions = [
-  "bottom",
-  "bottom-end",
-  "bottom-start",
-  "left",
-  "left-end",
-  "left-start",
-  "right",
-  "right-end",
-  "right-start",
-  "top",
-  "top-end",
-  "top-start"
-];
+export const popperPlacementPositions = placements;
 
 export default class PopperComponent extends React.Component {
   static propTypes = {