Making swift tools brings down SwiftToolchain v1 instead of v3

[roubachof]

Steps to Reproduce

1. cd binding-tools-for-swift
2. make

Expected Behavior

the build should bring down a copy of the built Swift reflector in the directory /path/to/binding-tools-for-swift/SwiftToolchain-v3-GITHASH

Actual Behavior

the build brings down SwiftToolchain-v1-901346864e91265a9a1dd2f149fe6235b59d2095

Logs

build-output.txt

Environment

   Found Xcode 10.2.1 in /Applications/Xcode_10.2.1.app
        Found CoreSimulator.framework 587.35 (exactly 587.35 is recommended)
    Found Mono 6.4.0.208 (at least 6.4.0.0 and not more than 6.4.0.999 is required)
    Found Xamarin.iOS 12.0.0.15 (at least 12.0.0.15 and not more than 12.0.0.15 is required)
    Found Xamarin.Mac 5.0.0.0 (at least 5.0.0.0 and not more than 5.0.0.0 is required)
System check succeeded

[stephen-hawley]

@roubachof thanks for pointing this out. It looks like a parity error between the docs and the scripts. I'll figure out which one to change and take care of that.