chore: upgrade spectron

[ekoeryanto]

fixes #467

[ekoeryanto]

But, what about make spectron and electron as peers?

[nklayman]

@ekoeryanto spectron cannot be a peer dep as it is imported by the testWithSpectron feature. I plan on releasing v2 of this plugin with upgrades to all major deps, including spectron.

[ekoeryanto]

@nklayman I think we should use correct spectron version based on choosen electron version.

Electron Version	Spectron Version
~1.0.0	~3.0.0
~1.1.0	~3.1.0
~1.2.0	~3.2.0
~1.3.0	~3.3.0
~1.4.0	~3.4.0
~1.5.0	~3.5.0
~1.6.0	~3.6.0
~1.7.0	~3.7.0
~1.8.0	~3.8.0
^2.0.0	^4.0.0
^3.0.0	^5.0.0
^4.0.0	^6.0.0
^5.0.0	^7.0.0
^6.0.0	^8.0.0

[nklayman]

I can't do that though as it is defined in the package.json which shouldn't be changed.

[nklayman]

Closing as v2.0 beta allows the user to choose their version of spectron.