update dependencies

package.json

@@ -18,7 +18,7 @@
 	},
 	"icon": "icon.png",
 	"engines": {
-		"vscode": "^1.31.0"
+		"vscode": "^1.20.0"
 	},
 	"keywords": [
 		"maya",
@@ -41,16 +41,14 @@
 	"scripts": {
 		"vscode:prepublish": "npm run compile",
 		"compile": "tsc -p ./",
-		"watch": "tsc -watch -p ./",
-		"postinstall": "node ./node_modules/vscode/bin/install"
+		"watch": "tsc -watch -p ./"
 	},
 	"devDependencies": {
-		"@types/node": "^6.0.42",
-		"@types/vscode": "^1.31.0",
-		"ts-loader": "^7.0.1",
-		"tslint": "^5.11.0",
-		"typescript": "^2.1.6",
-		"vscode": "^1.1.17"
+		"@types/node": "^12.12.0",
+		"@types/vscode": "^1.20.0",
+		"tslint": "^5.19.0",
+		"typescript": "^3.8.3",
+		"vscode-test": "^1.3.0"
 	},
 	"dependencies": {
 		"vscode-extension-telemetry": "^0.1.3"