Correct typo.

readme.md

@@ -1,5 +1,5 @@
 ## FerretOS Build Environment (FBE)
-The FerretOS Build Environment (FBE) is the official build environment for compiling FerretOSOS.
+The FerretOS Build Environment (FBE) is the official build environment for compiling FerretOS.
 Currently, it is targeted at Linux only, however a Windows and FerretOS versions will be available
 in the future as well.