README.md: improve markup

README.md

@@ -1,4 +1,4 @@
-pstack - print stack trace of running processes
+# pstack - print stack trace of running processes
 
 pstack dumps a stack trace for a process, given the pid of that
 process.  If the process named is part of a thread group, then all the threads
@@ -6,8 +6,9 @@ inthe group are traced.  See the man page for more information.
 
 This program was inspired by the 'pstack' program available on Solaris.
 
-SUPPORTED PLATFORMS:
-	This program runs on 32 bit x86 machines, using ELF binaries
+## Supported Platforms
+
+This program runs on 32 bit x86 machines, using ELF binaries
 generated from GNU compilers.  If threads are being used, it depends
 on a debuggable version of the pthreads library to find the threads in
 the thread group.  If anyone wants to port this to other
@@ -15,22 +16,20 @@ architectures, please let me know about questions you may have, or
 achievements you have made.  I'd like to incorporate such changes into
 my version of the code.
 
-FEATURES:
-	symbolic address dumping
-  thread group support
+## Features
 
-BUILD:
-   make
+* symbolic address dumping
+* thread group support
 
-INSTALL:
-	 make install
+## Build, install, uninstall
 
-UNINSTALL:
-   make uninstall
+    make
+    make install
+    make uninstall
 
-NOTE: you must be root to [un]install.  pstack will run fine from any
+**Note:** you must be root to [un]install. pstack will run fine from any
 directory, install just puts the binary and man page in 'normal'
-places (/usr/local/...)
+places (`/usr/local/...`)
 
 USAGE:
 	pstack pid [...]