Bump version to 0.2.7 #125

Job	Run time
test (aarch64-unknown-linux-gnu)	1m 0s
test (x86_64-unknown-linux-gnu)	24s
test (riscv64gc-unknown-linux-gnu)	56s
test (riscv32gc-unknown-linux-gnu)	1m 41s
test (i686-unknown-linux-gnu)	50s
	4m 51s

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