Changed target of TypeScript compilation to es2016

Partially addressed to #745

.size-limit.js

@@ -4,11 +4,11 @@ module.exports = [
 	{
 		name: 'ESM',
 		path: 'dist/lightweight-charts.esm.production.js',
-		limit: '45.3 KB',
+		limit: '42.9 KB',
 	},
 	{
 		name: 'Standalone',
 		path: 'dist/lightweight-charts.standalone.production.js',
-		limit: '45.9 KB',
+		limit: '43.5 KB',
 	},
 ];

tsconfig.options.json

@@ -5,12 +5,7 @@
 		"importHelpers": true,
 		"lib": [
 			"dom",
-			"es2015.collection",
-			"es2015.core",
-			"es2015.iterable",
-			"es2015.symbol.wellknown",
-			"es2016.array.include",
-			"es5"
+			"es2016"
 		],
 		"module": "esnext",
 		"moduleResolution": "node",
@@ -24,7 +19,7 @@
 		"rootDir": "./",
 		"strict": true,
 		"stripInternal": false,
-		"target": "es5",
+		"target": "es2016",
 		"typeRoots": [
 			"./src/typings",
 			"node_modules/@types"

website/docs/intro.md

@@ -6,6 +6,15 @@ sidebar_position: 0
 
 # Getting started
 
+## Requirements
+
+First of all, Lightweight Charts is _a client-side_ library.
+This means that it does not and cannot work on the server-side (i.e. NodeJS), at least out of the box.
+
+The code of `lightweight-charts` package is targeted to _es2016_ language specification.
+Thus, all the browsers you need to work with should support this language revision (see [this compatibility table](https://kangax.github.io/compat-table/es2016plus/)).
+If you need to support the previous revisions, you could try to setup a transpilation of the package to the target you need to support in your build system (e.g. by using Babel).
+
 ## Installation
 
 The first thing you need to do to use `lightweight-charts` is to install it from [npm](https://www.npmjs.com/):