Remove unused DCC_IMAP_DEBUG variable

README.md

@@ -102,9 +102,6 @@ $ cargo build -p deltachat_ffi --release
 
 ## Debugging environment variables 
 
-- `DCC_IMAP_DEBUG`: if set IMAP protocol commands and responses will be
-  printed
-
 - `DCC_MIME_DEBUG`: if set outgoing and incoming message will be printed 
 
 - `RUST_LOG=repl=info,async_imap=trace,async_smtp=trace`: enable IMAP and

src/lib.rs

@@ -104,8 +104,5 @@ pub mod accounts;
 /// if set imap/incoming and smtp/outgoing MIME messages will be printed
 pub const DCC_MIME_DEBUG: &str = "DCC_MIME_DEBUG";
 
-/// if set IMAP protocol commands and responses will be printed
-pub const DCC_IMAP_DEBUG: &str = "DCC_IMAP_DEBUG";
-
 #[cfg(test)]
 mod test_utils;