DPIMech v0.2.7

What's Changed

• Cargo.lock: 0.2.6 by @halilkhrmn in #10
• Screenshots in the READMEs and on the site by @halilkhrmn in #11
• Linux is no longer a preview; drop the dpimngr upgrade note by @halilkhrmn in #12
• 0.2.7: fix the Fedora (COPR) build; CI checks Cargo.lock by @halilkhrmn in #13

Full Changelog: v0.2.6...v0.2.7