Update rtt-target requirement from 0.3.1 to 0.4.0 in /rtic_v1/stm32l4_heartbeat#110

dependabot[bot] wants to merge 1 commit intomasterrtic-rs/rtic-examples:masterfrom

dependabot/cargo/rtic_v1/stm32l4_heartbeat/rtt-target-0.4.0rtic-rs/rtic-examples:dependabot/cargo/rtic_v1/stm32l4_heartbeat/rtt-target-0.4.0Copy head branch name to clipboard