Update u8g2 (#18) #163

Job	Run time
Build with 'embedded_graphics_textstyle' feature	18s
Build with 'std' feature	21s
Build (aarch64-unknown-linux-gnu)	59s
Build examples	2m 17s
Build (x86_64-pc-windows-gnu)	1m 20s
Build (x86_64-unknown-linux-gnu)	31s
Build with no features	11s
Build (arm-unknown-linux-gnueabi)	39s
Build for no-std targets (thumbv6m-none-eabi)	1m 11s
Check generated fonts	1m 52s
Build (armv7-unknown-linux-gnueabihf)	34s
Build for no-std targets (thumbv7em-none-eabihf)	32s
Build (riscv64gc-unknown-linux-gnu)	36s
Documentation	18s
Memory leaks	38s
Lints	29s
Minimum Supported Rust Version	5m 24s
semver	17s
Test Suite	30s
Publish version	0s
	18m 57s

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