build

bump fern to v0.7 #137

Job	Run time
build-apple (x86_64-apple-darwin)	1m 59s
build-corss (x86_64-unknown-linux-gnu)	2m 38s
build-apple (aarch64-apple-darwin)	2m 31s
build-windows (x86_64-pc-windows-msvc)	3m 31s
build-corss (x86_64-unknown-linux-musl)	2m 51s
build-apple (aarch64-apple-ios)	1m 53s
build-corss (x86_64-pc-windows-gnu)	3m 7s
build-corss (x86_64-linux-android)	3m 24s
build-corss (aarch64-unknown-linux-gnu)	3m 17s
build-corss (aarch64-unknown-linux-musl)	2m 45s
build-corss (aarch64-linux-android)	3m 7s
build-corss (arm-unknown-linux-gnueabi)	2m 35s
build-corss (arm-unknown-linux-gnueabihf)	2m 46s
build-corss (arm-unknown-linux-musleabi)	2m 51s
build-corss (arm-unknown-linux-musleabihf)	4m 6s
build-corss (armv7-unknown-linux-gnueabi)	2m 58s
build-corss (armv7-unknown-linux-gnueabihf)	3m 6s
build-corss (armv7-unknown-linux-musleabi)	2m 58s
build-corss (armv7-unknown-linux-musleabihf)	2m 50s
	55m 13s

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