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npm script build:browser is failing

With a fresh clone of the repository, the build:browser script is failing:

$ rollup -c --environment DEPS -f umd -o dist/buble.deps.js
Module C:\Users\me\AppData\Local\Temp\buble\node_modules\vlq\dist\vlq.js does not export encode (imported by C:\Users\me\AppData\Local\Temp\buble\node_modules\magic-string\dist\magic-string.es6.js)
Error: Module C:\Users\me\AppData\Local\Temp\buble\node_modules\vlq\dist\vlq.js does not export encode (imported by C:\Users\me\AppData\Local\Temp\buble\node_modules\magic-string\dist\magic-string.es6.js)
    at Module.trace (C:\Users\me\AppData\Local\Temp\buble\node_modules\rollup\src\Module.js:652:30)
    at C:\Users\me\AppData\Local\Temp\buble\node_modules\rollup\src\Module.js:261:30
    at Array.forEach (<anonymous>)
    at C:\Users\me\AppData\Local\Temp\buble\node_modules\rollup\src\Module.js:259:25
    at Array.forEach (<anonymous>)
    at Module.bindReferences (C:\Users\me\AppData\Local\Temp\buble\node_modules\rollup\src\Module.js:252:19)
    at C:\Users\me\AppData\Local\Temp\buble\node_modules\rollup\src\Bundle.js:96:44
    at Array.forEach (<anonymous>)
    at C:\Users\me\AppData\Local\Temp\buble\node_modules\rollup\src\Bundle.js:96:18
    at tryCatch (C:\Users\me\AppData\Local\Temp\buble\node_modules\rollup\node_modules\es6-promise\lib\es6-promise\-internal.js:187:12)