golangci-lint

fixes samples-go linter errors #129

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Run time

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Job	Run time
lint (echo-mysql)	13s
lint (echo-sql)	14s
lint (fasthttp-postgres)	11s
lint (gin-mongo)	14s
lint (gin-redis)	11s
lint (go-jwt)	11s
lint (go-twilio)	12s
lint (graphql-sql)	17s
lint (http-pokeapi)	17s
lint (mux-elasticsearch)	12s
lint (mux-mysql)	18s
lint (mux-sql)	17s
lint (S3-Keploy)	12s
lint (sse-svelte)	14s
lint (users-profile)	12s
	3m 25s