Upgrading dependencies to fix build error.

See babel/babel#11439

package.json

@@ -1,6 +1,6 @@
 {
   "name": "single-spa-svelte",
-  "version": "2.0.0",
+  "version": "2.1.0",
   "description": "a single-spa plugin for svelte applications",
   "main": "lib/single-spa-svelte.js",
   "scripts": {
@@ -35,18 +35,18 @@
   },
   "homepage": "https://github.com/single-spa/single-spa-svelte#readme",
   "devDependencies": {
-    "@babel/cli": "^7.8.4",
-    "@babel/core": "^7.8.6",
-    "@babel/preset-env": "^7.8.6",
-    "@types/jest": "^25.1.3",
+    "@babel/cli": "^7.11.6",
+    "@babel/core": "^7.11.6",
+    "@babel/preset-env": "^7.11.5",
+    "@types/jest": "^26.0.14",
     "babel-eslint": "^11.0.0-beta.2",
-    "babel-jest": "^25.1.0",
-    "eslint": "^6.8.0",
+    "babel-jest": "^26.5.2",
+    "eslint": "^7.11.0",
     "eslint-config-important-stuff": "^1.1.0",
-    "husky": "^4.2.3",
-    "jest": "^25.1.0",
-    "jest-cli": "^25.1.0",
-    "prettier": "^1.19.1",
-    "pretty-quick": "^2.0.1"
+    "husky": "^4.3.0",
+    "jest": "^26.5.2",
+    "jest-cli": "^26.5.2",
+    "prettier": "^2.1.2",
+    "pretty-quick": "^3.0.2"
   }
 }