reflow README lines

never use github's web interface for editing READMEs, it messes up :-(

README.md

@@ -8,9 +8,16 @@ POSIX and Windows.
     $ ./demumble "?Fx_i@@YAHP6AHH@Z@Z"
     int __cdecl Fx_i(int (__cdecl*)(int))
 
-It has several nice features that c++filt lacks (and lacks many of c++filt's features I never use).
+It has several nice features that c++filt lacks (and lacks many of c++filt's
+features I never use).
 
-Smart about underscores: C++ symbols have an additional leading underscore on OS X. `operator new` is mangled as `_Znw` on Linux but `__Znw` on Mac. OS X's c++filt automatically strips one leading underscore, but Linux's c++filt doesn't. So if you want to demangle a Linux symbol on OS X, you need to pass `-n` to tell it to not strip the underscore, and if you want to demangle an OS X symbol on Linux you likewise need to pass `-_`. demumble just does the right thing:
+Smart about underscores: C++ symbols have an additional leading underscore on
+OS X. `operator new` is mangled as `_Znw` on Linux but `__Znw` on Mac. OS X's
+c++filt automatically strips one leading underscore, but Linux's c++filt
+doesn't. So if you want to demangle a Linux symbol on OS X, you need to pass
+`-n` to tell it to not strip the underscore, and if you want to demangle an OS
+X symbol on Linux you likewise need to pass `-_`. demumble just does the right
+thing:
 
     $ c++filt _Znw
     _Znw
@@ -21,7 +28,10 @@ Smart about underscores: C++ symbols have an additional leading underscore on OS
     $ demumble __Znw
     operator new
 
-Smart about filtering: Both c++filt and demumble can work as a stdin filter. demumble only demangles function symbols (which never look like other words), while c++filt defaults to demangling type names too, which are likely to look like regular words. demumble does demangle types when they're passed as args:
+Smart about filtering: Both c++filt and demumble can work as a stdin filter.
+demumble only demangles function symbols (which never look like other words),
+while c++filt defaults to demangling type names too, which are likely to look
+like regular words. demumble does demangle types when they're passed as args:
 
     $ echo 'I like Pi and _Znw' | c++filt
     I like int* and _Znw
@@ -32,14 +42,16 @@ Smart about filtering: Both c++filt and demumble can work as a stdin filter. dem
     $ demumble Pi
     int*
 
-Cross-platform: demumble runs on Windows. demumble can demangle Windows-style symbols (also when running on non-Windows).
+Cross-platform: demumble runs on Windows. demumble can demangle Windows-style
+symbols (also when running on non-Windows).
 
     $ demumble '??2@YAPEAX_K@Z'
     void * __ptr64 __cdecl operator new(unsigned __int64)
     $ c++filt '??2@YAPEAX_K@Z'
     ??2@YAPEAX_K@Z
 
-demumble also has a flag to make it print only things that look like symbols. For example, to print demangled names of all functions defined in a bitcode file:
+demumble also has a flag to make it print only things that look like symbols.
+For example, print demangled names of all functions defined in a bitcode file:
 
     $ grep '^define' bitcode-win.ll  | demumble -m | head -1
     unsigned int __cdecl v8::RoundUpToPowerOfTwo32(unsigned int)