v1.5.1

This release fixes a bug where APIs that used a decimal version number (e.g. v2.1) had underscores instead of dots in the literal of the build overload (e.g. v2_1). This meant that for those APIs the resource returned by build wasn't correctly inferred. The bug happened because the dots were converted to be safe to use in package paths. Now the conversion only happens where the version is actually used in a path.