Adds missing 'of'
Correct typos in readme

A 'hold' is missing its 'h' and a variable was misnamed. This patch fixes these issues.
Update sds.c

Fix mistakes in sdstrim comments
Merge branch 'master' of https://github.com/bjmc/sds
Merge branch 'patch-1' of https://github.com/eXeC64/sds
Merge branch 'patch-1' of https://github.com/jseward/sds