WIP Workaround to make danger work on linux with swift 5.0

[f-meloni]

I wanted to test if we can have a workaround until the problem reported on #214 is not fixed

[DangerCI]

	Fails
🚫	danger-swift` failed.

Log

[1/18] Compiling CYaml src/writer.c
[2/18] Compiling SourceKit SourceKit.m
[3/18] Compiling Swift Module 'SwiftyTextTable' (1 sources)
[4/18] Compiling Swift Module 'SWXMLHash' (3 sources)
[5/18] Compiling Swift Module 'Result' (4 sources)
[6/18] Compiling Swift Module 'CryptoSwift' (75 sources)
[7/18] Compiling Clang_C Clang_C.m
[8/18] Compiling Swift Module 'Commandant' (9 sources)
[9/18] Compiling CYaml src/scanner.c
[10/18] Compiling CYaml src/reader.c
[11/18] Compiling CYaml src/parser.c
[12/18] Compiling CYaml src/emitter.c
[13/18] Compiling CYaml src/api.c
[14/18] Compiling Swift Module 'Yams' (16 sources)
[15/18] Compiling Swift Module 'SourceKittenFramework' (36 sources)
[16/18] Compiling Swift Module 'SwiftLintFramework' (291 sources)
[17/18] Compiling Swift Module 'swiftlint' (14 sources)
[18/18] Linking ./.build/x86_64-unknown-linux/debug/swiftlint
Stack dump:
0.	Program arguments: /home/travis/.swiftenv/versions/5.0/usr/bin/swift -frontend -interpret /tmp/_tmp_dangerfile.swift -disable-objc-interop -I .build/debug -module-name _tmp_dangerfile -lDangerDeps -- /tmp/danger-dsl.json /tmp/danger-response.json 
#0 0x0000000004298144 PrintStackTraceSignalHandler(void*) (/home/travis/.swiftenv/versions/5.0/usr/bin/swift+0x4298144)
#1 0x00000000042962a0 llvm::sys::RunSignalHandlers() (/home/travis/.swiftenv/versions/5.0/usr/bin/swift+0x42962a0)
#2 0x00000000042984a8 SignalHandler(int) (/home/travis/.swiftenv/versions/5.0/usr/bin/swift+0x42984a8)
#3 0x00007ffaea402330 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x10330)
#4 0x00007ffaea82235c
#5 0x00007ffaea82133a
#6 0x0000000000c98fd6 llvm::MCJIT::runFunction(llvm::Function*, llvm::ArrayRef<llvm::GenericValue>) (/home/travis/.swiftenv/versions/5.0/usr/bin/swift+0xc98fd6)
#7 0x0000000000c9cfcf llvm::ExecutionEngine::runFunctionAsMain(llvm::Function*, std::vector<std::string, std::allocator<std::string> > const&, char const* const*) (/home/travis/.swiftenv/versions/5.0/usr/bin/swift+0xc9cfcf)
#8 0x000000000050a537 swift::RunImmediately(swift::CompilerInstance&, std::vector<std::string, std::allocator<std::string> > const&, swift::IRGenOptions&, swift::SILOptions const&) (/home/travis/.swiftenv/versions/5.0/usr/bin/swift+0x50a537)
#9 0x00000000004e15b7 performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*) (/home/travis/.swiftenv/versions/5.0/usr/bin/swift+0x4e15b7)
#10 0x00000000004dc947 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) (/home/travis/.swiftenv/versions/5.0/usr/bin/swift+0x4dc947)
#11 0x000000000048ddc3 main (/home/travis/.swiftenv/versions/5.0/usr/bin/swift+0x48ddc3)
#12 0x00007ffae8bcff45 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21f45)
#13 0x000000000048c018 _start (/home/travis/.swiftenv/versions/5.0/usr/bin/swift+0x48c018)
Got URL for JSON: /tmp/danger-dsl.json
�[0;0mCreated a temporary file for the Dangerfile DSL at: /tmp/danger-dsl.json
�[0;0mRunning Dangerfile at: Dangerfile.swift
�[0;0mPreparing to compile
�[0;0mRunning: /home/travis/.swiftenv/shims/swiftc --driver-mode=swift -L .build/debug -I .build/debug -lDangerDeps /tmp/_tmp_dangerfile.swift /tmp/danger-dsl.json /tmp/danger-response.json
�[0;0mCompleted evaluation
�[0;0m�[31mERROR: Dangerfile eval failed at Dangerfile.swift
�[0;0m�[31mERROR: Could not get the results JSON file at /tmp/danger-response.json
�[0;0m

Generated by 🚫 dangerJS against 35575c1