- upgrade dependencies

- add trailing slash for canonical and alternative links in `Helmet`

Signed-off-by: Dmitriy Nevzorov <jimmy.lugat@gmail.com>

Author: jimmyn

package.json

@@ -42,19 +42,19 @@
     "release": "release-it"
   },
   "devDependencies": {
-    "@babel/cli": "^7.10.3",
+    "@babel/cli": "^7.10.5",
     "@types/bluebird": "^3.5.32",
-    "@types/react": "^16.9.41",
+    "@types/react": "^16.9.43",
     "@types/react-helmet": "^6.0.0",
     "babel-preset-gatsby-package": "^0.4.6",
-    "gatsby": "^2.23.11",
+    "gatsby": "^2.24.3",
     "husky": "^4.2.5",
-    "i18next": "^19.5.1",
+    "i18next": "^19.6.2",
     "prettier": "^2.0.5",
     "pretty-quick": "^2.0.1",
     "react-i18next": "^11.7.0",
-    "release-it": "^13.6.3",
-    "typescript": "^3.9.5"
+    "release-it": "^13.6.5",
+    "typescript": "^3.9.7"
   },
   "dependencies": {
     "bluebird": "^3.7.2",

src/Helmet.tsx

@@ -5,7 +5,8 @@ import {useI18next} from './useI18next';
 export const Helmet: React.FC<HelmetProps> = ({children, ...props}) => {
   const {languages, language, originalPath, defaultLanguage, siteUrl = ''} = useI18next();
   const createUrlWithLang = (lng: string) => {
-    return `${siteUrl}${lng === defaultLanguage ? '' : `/${lng}`}${originalPath}`;
+    const url = `${siteUrl}${lng === defaultLanguage ? '' : `/${lng}`}${originalPath}`;
+    return url.endsWith('/') ? url : `${url}/`;
   };
   return (
     <ReactHelmet {...props}>