Update README.md

Remove BlocksRuntime from the dependency set.  We build our own copy of BlocksRuntime and use the headers from libdispatch.  We want to ensure that everything sees the correct version of BlocksRuntime.

Author: compnerd

README.md

@@ -98,7 +98,7 @@ Instructions for installing CMake and Ninja directly can be found [below](#build
 
 For Ubuntu, you'll need the following development dependencies:
 
-    sudo apt-get install git cmake ninja-build clang python uuid-dev libicu-dev icu-devtools libedit-dev libxml2-dev libsqlite3-dev swig libpython-dev libncurses5-dev pkg-config libblocksruntime-dev libcurl4-openssl-dev systemtap-sdt-dev tzdata rsync
+    sudo apt-get install git cmake ninja-build clang python uuid-dev libicu-dev icu-devtools libedit-dev libxml2-dev libsqlite3-dev swig libpython-dev libncurses5-dev pkg-config libcurl4-openssl-dev systemtap-sdt-dev tzdata rsync
 
 **Note:** LLDB currently requires at least `swig-1.3.40` but will successfully build
 with version 2 shipped with Ubuntu.