• VSCode Version: 1.10.1 (1.10.1)
• OS Version: macOS 10.12.3 (16D32)

Steps to Reproduce:

1. Type "import" in a TypeScript file to insert an import statement snippet.
2. this statement uses single quote mark(') instead of double quotemark(").

From TypeScript's source code and tslint recommendations, TypeScript should use double quotes for string.(As mentioned in coding guidelines: https://github.com/Microsoft/TypeScript/wiki/Coding-guidelines).

Please update these snippets to match the guide line.