build: bump react-popper to version 2

BREAKING CHANGE: if you target the `data-placement` of the Popover to
customize it the selector is now `data-popper-placement`. See the
migration guide for more information:
https://popper.js.org/docs/v2/migration-guide/

package.json

@@ -137,7 +137,7 @@
     "react-router-dom": "4.1.0",
     "react-scripts": "^1.1.5",
     "react-syntax-highlighter": "^7.0.4",
-    "react-test-renderer": "^16.7.0",
+    "react-test-renderer": "^16.8.0",
     "react-transition-group": "~2.3.1",
     "recompose": "^0.30.0",
     "require-dir": "0.3.2",
@@ -169,7 +169,8 @@
     "react-datepicker": "^1.8.0",
     "react-dropzone": "^4.2.11",
     "react-modal": "^3.8.1",
-    "react-popper": "^1.3.3",
+    "react-popper": "^2.2.3",
+    "@popperjs/core": "^2.4.0",
     "react-select": "^2.2.0",
     "react-transition-group": "~2.3.1"
   },

packages/help/src/__snapshots__/Help.spec.js.snap

@@ -2,6 +2,7 @@
 
 exports[`<Help> Render Should render Help component 1`] = `
 <span
+  onClick={[Function]}
   onMouseEnter={[Function]}
   onMouseLeave={[Function]}
 >

packages/popover/package.json

@@ -14,7 +14,8 @@
 	"dependencies": {
 		"@axa-fr/react-toolkit-core": "^1.3.13",
 		"prop-types": "^15.5.10",
-		"react-popper": "^1.3.3"
+		"react-popper": "^2.2.3",
+		"@popperjs/core": "^2.4.0"
 	},
 	"license": "MIT",
 	"publishConfig": {