Added ATO link to readme.

README.md

@@ -2,13 +2,21 @@
 
 Pip is an interpreted, imperative code-golf language. See the [GitHub wiki](https://github.com/dloscutoff/pip/wiki) for an introduction to the language, or the [documentation site](https://dloscutoff.github.io/pipdoc/) for a language reference.
 
+### Why Pip?
+
+Unlike most golfing languages, but like many practical languages, Pip is an imperative language with infix operators. It also uses plain ASCII instead of a custom codepage. These features make it a great introduction to golflangs for users of imperative languages like Python, JavaScript, and Perl.
+
+In [a survey of Code Golf StackExchange submissions](https://codegolf.meta.stackexchange.com/a/8891/16766), Pip scored slightly better than GolfScript and CJam, but not quite as good as Pyth.
+
 ### Usage
 
-The quickest way to get started using Pip is at [Try It Online!](https://tio.run/##K8gs@P8/3Sv7////Hqk5Ofn/w/OLclIUAQ) (Thanks, [Dennis](http://codegolf.stackexchange.com/users/12012/dennis)!) Note, however, that the version of Pip on TIO is [Pip Classic](https://github.com/dloscutoff/pip/releases/tag/v0.18), which doesn't have any of the updates and new features since 2018.
+You can run Pip at the following online interpreters:
 
-An up-to-date version of Pip is hosted at [Replit](https://replit.com/@dloscutoff/pip). Clicking the run button will drop you into an interactive mode session, which prompts for arguments and code and then executes the program.
+- [Attempt This Online](https://ato.pxeger.com/run?1=m724ILNgwYKlpSVpuhaL072yISyowOZoJY_UnJx8JR0FpfD8opwURaVYqBQA) typically supports the latest release of Pip (but possibly not the latest commit). *(Thanks to [pxeger](https://github.com/pxeger) for adding Pip support to ATO!)*
+- [Try It Online](https://tio.run/##K8gs@P8/3Sv7////Hqk5Ofn/w/OLclIUAQ) supports [version 0.18](https://github.com/dloscutoff/pip/releases/tag/v0.18), aka [Pip Classic](https://dloscutoff.github.io/pipdoc/pip-classic), which is a few years out of date. *(Thanks to [Dennis](https://github.com/DennisMitchell) for adding Pip support to TIO!)*
+- [Replit](https://replit.com/@dloscutoff/pip) hosts the latest commit of Pip, with the downside that it uses a command-line interface and doesn't allow permalinking. Clicking the run button will drop you into an interactive  session, which prompts for arguments and code and then executes the program. *(Thanks to [razetime](https://github.com/razetime) for the idea of hosting Pip on Replit!)*
 
-Pip is implemented in Python 3. The main interpreter is the `pip.py` file. It should run on most systems with Python 3 installed simply by invoking `pip.py` in the directory where you put it (for *nix systems, use `./pip.py`). You may also wish to modify the `PATH` environment variable to include the path to Pip, so that you can invoke it from anywhere. Typical invocation patterns:
+You can also clone the Pip repository and run it from the command line. Pip is implemented in Python 3. The main interpreter is the `pip.py` file. It should run on most systems with Python 3 installed simply by invoking `pip.py` in the directory where you put it (for *nix systems, use `./pip.py`). You may also wish to modify the `PATH` environment variable to include the path to Pip, so that you can invoke it from anywhere. Typical invocation patterns:
 
 `pip.py [flags] path/to/codefile.pip [args]`
 
@@ -18,10 +26,6 @@ Pip is implemented in Python 3. The main interpreter is the `pip.py` file. It sh
 
 Execute `pip.py --help` for more detailed information.
 
-### Why Pip?
-
-Pip's main reason for existence is to be a golfing language that 1) is imperative, and 2) uses infix operators. I do enjoy the challenge of stack-based programming from time to time, but I find the imperative paradigm much easier to think in, and therefore better. In [a survey of Code Golf StackExchange submissions](https://codegolf.meta.stackexchange.com/a/8891/16766), Pip scored slightly better than GolfScript and CJam, but not quite as good as Pyth.
-
 ### What does the name refer to?
 
 [This fellow](http://en.wikipedia.org/wiki/Pip_(Great_Expectations)), of course.