optimized /dev/shm string generation

usr/share/doc/rpass/changelog

@@ -1,6 +1,6 @@
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-rpass-2021.09.08.pr4
+rpass-2021.09.14.pr4
 
 The Housekeeping Update (Pt. 1) - Fourth public release of rpass
 
@@ -9,7 +9,7 @@ making any major changes in the future.
 
 New features:
 
-- added initial clipboard (password copy) support
+- added clipboard support for copying entry information
 **overhaul error messages using exceptions
 **add exceptions for unknown arguments
 **make clean, colorful file list by exporting to document and removing extensions
@@ -21,6 +21,7 @@ Changes:
 - fixed gpg decryption warnings
 - added version info argument
 - re-ordered config wizard for better rsync support
+- optimized code for random string generation in /dev/shm
 **optimize code (specifically for when there is no folder but there is a slash)
 **fix rsync delete on upload
 **properly comment the code