Update README.md to mention removal of policy support

README.md

@@ -1,25 +1,23 @@
 # java-sandbox-agent [![Build Status](https://github.com/DMOJ/java-sandbox-agent/workflows/build/badge.svg)](https://github.com/DMOJ/java-sandbox-agent/actions/)
-Policy-based Java sandbox with instrumentation support for online judges.
+Java class sandbox with instrumentation support for online judges. 
 
 It implements:
 
-* [**security policy-based sandboxing**](https://docs.oracle.com/javase/7/docs/technotes/guides/security/PolicyFiles.html) (see [**DMOJ/judge**](https://github.com/DMOJ/judge) for [example policy](https://github.com/DMOJ/judge/blob/master/dmoj/executors/java-security.policy))
 * a much faster, [unsynchronized ASCII-only `System.out` stream](https://github.com/DMOJ/java-sandbox-agent/blob/master/src/main/java/ca/dmoj/java/UnsafePrintStream.java) that's suitable for single-threaded online-judging scenarios
 * support for **disallowing particular classes from being loaded**, to force certain solutions trivialized by the standard library
 * optional **unbuffering of standard output**, for interactive problems without requiring users to flush manually
 * logging of exceptional exits to a state file
 
 ## Usage
 
-To run a class `Submission` with agent and policy stored in `/code`, the following suffices:
+To run a class `Submission` with agent the following suffices:
 
 ```
-$ java -client -javaagent:/code/java-sandbox-agent.jar=policy:/code/policy[,option ...] Submission
+$ java -client -javaagent:/code/java-sandbox-agent.jar=[option, ...] Submission
 ```
 
 Supported fields for the `option` list are:
 
 * `nobigmath` — disables `BigInteger` and `BigDecimal`, raising [appropriate exceptions](https://github.com/DMOJ/java-sandbox-agent/blob/master/src/main/java/ca/dmoj/java/BigIntegerDisallowedException.java) if they are used
 * `unicode` — encodes `System.out` as UTF-8 instead of ASCII, sacrificing performance for Unicode support
 * `nobuf` — sets `System.out` as being line-buffered, for interactive problems
-