prometheus: release 0.13.4 #327

Job	Run time
Lints, pinned toolchain	35s
Lints, pinned toolchain	35s
Build, minimum toolchain	1m 31s
Build, minimum toolchain	1m 31s
Benchmarks (criterion)	7m 29s
Benchmarks (criterion)	7m 29s
Tests, stable toolchain	1m 45s
Tests, stable toolchain	1m 45s
Tests, unstable toolchain (beta)	1m 15s
Tests, unstable toolchain (beta)	1m 15s
Tests, unstable toolchain (nightly)	35s
Tests, unstable toolchain (nightly)	1m 17s
	27m 2s

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