Fix minor doc typo (#41)

Signed-off-by: Philippe Ombredanne <[email protected]>

README.md

@@ -9,7 +9,7 @@
  The ClamAV® Bytecode Compiler is a tool to build cross-platform advanced
  malware detection plugins for the ClamAV® open source antivirus engine.
  We call these plugins "bytecode signatures". Bytecode signatures are are
- executed by a ClamAV using either an LLVM JIT runtime or an interpeter
+ executed by a ClamAV using either an LLVM JIT runtime or an interpreter
  runtime. These signatures extend ClamAV's file format support and provide
  detection capabilities above and beyond the limitations of content-based
  logical signatures.