Invalid code when using special symbols

## Steps to Reproduce

There's no space between the return and the `context` keyword, leading to invalid code:

```js
var JavaScriptObfuscator = require("javascript-obfuscator");

var obfuscationResult = JavaScriptObfuscator.obfuscate(
  `return 𝐜𝐨𝐧𝐭𝐞𝐱𝐭`,
  {
    reservedNames: ["𝐜𝐨𝐧𝐭𝐞𝐱𝐭"],
  }
);

console.log(obfuscationResult.getObfuscatedCode());

// return𝐜𝐨𝐧𝐭𝐞𝐱𝐭
```
