Cargo: Fix mavlink version

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Author: patrickelectric

Cargo.toml

@@ -26,7 +26,7 @@ pnet = "0.25"
 regex = "1.3"
 
 ## Mavlink
-mavlink = { version = "0.8.1", features = ["default", "emit-extensions"] }
+mavlink = { version = "=0.8.1", features = ["default", "emit-extensions"] }
 
 ## RTSP server
 glib = { version = "0.9", optional = true }