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"checksum format error" occurs for binary checksum files

See original GitHub issue

I don’t know where this is documented, but it turns out that binary checksum files are allowed (ivy and maven both support them). coursier chokes:

> compile
[info] Updating g2
Downloading https://repo1.maven.org/maven2/com/google/android/gms/play-services-base/9.6.1/play-services-base-9.6.1.pom.sha1
Downloading https://repo1.maven.org/maven2/com/google/android/gms/play-services-base/9.6.1/play-services-base-9.6.1.pom
[warn] Android SDK updates available, run 'android-update' to update:
[warn]     Android SDK Platform-Tools 24.0.3
[warn]     Google APIs Intel x86 Atom_64 System Image
[warn]     Google APIs Intel x86 Atom System Image
[warn] libraryDependencies have changed, forcing clean build
[trace] Stack trace suppressed: run last *:coursierResolution for the full output.
[error] (*:coursierResolution) coursier.ResolutionException: Encountered 1 error(s) in dependency resolution:
[error]   com.google.android.gms:play-services-base:9.6.1:
[error]     checksum format error: C:\Users\pfnguyen\android-sdk-windows\extras\google\m2repository\com\google\android\gms\play-services-base\9.6.1\play-services-base-9.6.1.pom.sha1
[error]     not found:
[error]       C:\Users\pfnguyen\.ivy2\local\com.google.android.gms\play-services-base\9.6.1\ivys\ivy.xml
[error]       https://repo1.maven.org/maven2/com/google/android/gms/play-services-base/9.6.1/play-services-base-9.6.1.pom
[error]       C:\Users\pfnguyen\android-sdk-windows\extras\android\m2repository\com\google\android\gms\play-services-base\9.6.1\play-services-base-9.6.1.pom
[error] Total time: 3 s, completed Oct 4, 2016 12:06:32 PM

repro steps:

$ mkdir binchecksums
$ cd binchecksums
$ mkdir project
$ echo 'addSbtPlugin("org.scala-android" % "sbt-android" % "1.6.18")' > project/plugins.sbt
$ echo 'addSbtPlugin("io.get-coursier" % "sbt-coursier" % "1.0.0-M14-3")' >> project/plugins.sbt
$ sbt "gen-android com.foo Foo"
$ echo 'libraryDependencies += "com.google.android.gms" % "play-services-base" % "9.6.1"' >> build.sbt
$ sbt update