vscode: bump extension version to 0.2.0 #18

Job	Run time
Test - stable toolchain	1m 16s
Check WASM	36s
Docs - stable toolchain (recent)	48s
Prepare	3s
Test - MSRV	1m 20s
Test - nightly toolchain	1m 19s
Lint - nightly toolchain (recent)	51s
Docs - nightly toolchain (recent)	1m 5s
Format - nightly toolchain	22s
	7m 40s

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