upgrade to latest TSTL

[Keller18306]

Test Suites: 34 passed, 34 total
Tests:       202 passed, 202 total
Snapshots:   0 total
Time:        29.331 s, estimated 38 s
Ran all test suites matching /./i.

[Keller18306]

But (not bundled scripts):

ERROR: index.lua:2: attempt to call global '__TS__SourceMapTraceBack' (a nil value)

I suspect this is because all functions in lualib_bundle.lua have become local. I will try to fix this.