Iterate on README

Author: mkantor

README.md

@@ -14,21 +14,19 @@ echo '{@runtime context => :context.program.start_time}' | ./please --output-for
 
 ## What this repository is
 
-**This implementation of Please is a proof of concept**. There are plenty of bugs and missing
-pieces, and language syntax/semantics may change backwards-incompatibly on the way to an official
-release. This implementation is not particularly focused on performance, robustness, or developer
-experience—it's merely a place to experiment with ideas for the language. TypeScript was chosen
-because it's pretty good for rapid prototyping, but it's likely that another language will be used
-in a non-prototype implementation.
+**This implementation of Please is a proof of concept**. There are bugs and missing pieces, and
+language syntax/semantics may change backwards-incompatibly on the way to an official release.
+TypeScript was chosen because it's pretty good for rapid prototyping, but it's likely that another
+language would be used in a non-prototype implementation.
 
 ## Current state
 
 Enough pieces exist to write basic runnable programs. There is a type system, but it's not wired up
-in many places yet so mistakes often go unnoticed at compile time. The standard library is anemic,
-and it's not uncommon to encounter bugs in the compiler/runtime.
+in many places yet so mistakes often go unnoticed at compile time. The standard library is anemic
+and documentation is nonexistent.
 
-The current implementation of the runtime is an interpreter, but the plan is to eventually add one
-or more backends to allow building native executables.
+The current runtime is an interpreter, but the plan is to eventually add one or more backends to
+allow building native executables.
 
 ## What's next?