Update links to v4.0 in the documentation

Author: apangin

README.md

@@ -23,12 +23,12 @@ to learn about more features.
 
 # Download
 
-### Stable release: [3.0](https://github.com/async-profiler/async-profiler/releases/tag/v3.0)
+### Stable release: [4.0](https://github.com/async-profiler/async-profiler/releases/tag/v4.0)
 
-- Linux x64: [async-profiler-3.0-linux-x64.tar.gz](https://github.com/async-profiler/async-profiler/releases/download/v3.0/async-profiler-3.0-linux-x64.tar.gz)
-- Linux arm64: [async-profiler-3.0-linux-arm64.tar.gz](https://github.com/async-profiler/async-profiler/releases/download/v3.0/async-profiler-3.0-linux-arm64.tar.gz)
-- macOS x64/arm64: [async-profiler-3.0-macos.zip](https://github.com/async-profiler/async-profiler/releases/download/v3.0/async-profiler-3.0-macos.zip)
-- Profile converters: [converter.jar](https://github.com/async-profiler/async-profiler/releases/download/v3.0/converter.jar)
+- Linux x64: [async-profiler-4.0-linux-x64.tar.gz](https://github.com/async-profiler/async-profiler/releases/download/v4.0/async-profiler-4.0-linux-x64.tar.gz)
+- Linux arm64: [async-profiler-4.0-linux-arm64.tar.gz](https://github.com/async-profiler/async-profiler/releases/download/v4.0/async-profiler-4.0-linux-arm64.tar.gz)
+- macOS arm64/x64: [async-profiler-4.0-macos.zip](https://github.com/async-profiler/async-profiler/releases/download/v4.0/async-profiler-4.0-macos.zip)
+- Profile converters: [jfr-converter.jar](https://github.com/async-profiler/async-profiler/releases/download/v4.0/jfr-converter.jar)
 
 ### Nightly builds
 

docs/ConverterUsage.md

@@ -2,7 +2,7 @@
 
 async-profiler provides `jfrconv` utility to convert between different profile output formats.
 `jfrconv` can be found at the same location as the `asprof` binary. Converter is also available
-as a standalone Java application: [`jfr-converter.jar`](https://github.com/async-profiler/async-profiler/releases/download/v3.0/converter.jar).
+as a standalone Java application: [`jfr-converter.jar`](https://github.com/async-profiler/async-profiler/releases/download/v4.0/jfr-converter.jar).
 
 ## Supported conversions
 

docs/IntegratingAsyncProfiler.md

@@ -11,7 +11,7 @@ $ java -agentpath:/path/to/libasyncProfiler.so=start,event=cpu,file=profile.html
 
 Agent library is configured through the JVMTI argument interface.
 The format of the arguments string is described
-[in the source code](https://github.com/async-profiler/async-profiler/blob/v3.0/src/arguments.cpp#L44).
+[in the source code](https://github.com/async-profiler/async-profiler/blob/v4.0/src/arguments.cpp#L44).
 `asprof` actually converts command line arguments to that format.
 
 Another important use of attaching async-profiler as an agent is for continuous profiling.