Fix typo.

Author: bradfitz

README

@@ -1,9 +1,9 @@
 gitbrute brute-forces a pair of author+committer timestamps such that
-the resulting git commit hash your desired prefix.
+the resulting git commit has your desired prefix.
 
 It will find the most recent time that satisifies your prefix.
 
-Shorter prefixes match more quickly, of course.  The author &
+Shorter prefixes match more quickly, of course. The author &
 committer timestamp are not kept in sync.
 
 Example: https://github.com/bradfitz/deadbeef