c# 6.0 String interpolation not recognized by omnisharp

[shivambaku]

Environment data

.NET Command Line Tools (1.0.0-preview2-003131)

Product Information:
Version: 1.0.0-preview2-003131
Commit SHA-1 hash: 635cf40e58

Runtime Environment:
OS Name: Windows
OS Version: 10.0.14393
OS Platform: Windows
RID: win10-x64

VS Code version: 1.6.1
C# Extension version: 1.4

Steps to reproduce

Actual behavior is from Visual Studio Code and expected behavior is from Visual Studio 2015 community.
Not displaying the difference between regular string and interpolated may cause in buggy debug logs.

For example: one could write $"nameof(a)" instead of $"{nameof(a)}".

Expected behavior

Actual behavior