Refactoring is broken after parser changes

[BugDiver]

Description

Refactoring is not working as expected after changing the parser from redbaron to parso.
The issue is replicable from the command line and ide both.

Steps to reproduce

1. create a step name step1 and implement it.
2. refactor step1 to step "param"
3. refactor step "param" to step "inserted param" "param"
4. the step gets refactored successfully but it causes a script error

@step("step <inserted param> <asd>")
                                       ^
SyntaxError: duplicate argument 'arg0' in function definition

Information that will help us debug

• Gauge version -> Gauge version: 1.0.1 Commit Hash: 083a02f
• Gauge Python plugin version -> HEAD
• Python version -> 3.7.0
• getgauge package version, run pip3 show getgauge to get it -> Installed from source

Note

This started happening after merging the #96 by @surajbarkale.

[gaugebot]

The fix should be available in nightly >= 8/13/2018