misc doc fixes (#142)

- Point to the `v4` docs in README.md
- Fix the port numbers in examples/streaming/README.md

Signed-off-by: Joel Dice <joel.dice@akamai.com>

Author: dicej

README.md

@@ -6,7 +6,7 @@ Note that this SDK supersedes an earlier, experimental version, which may be
 found in the [old-sdk](https://github.com/spinframework/spin-python-sdk/tree/old-sdk)
 branch.
 
-## [API Documentation](https://spinframework.github.io/spin-python-sdk/v3/index.html)
+## [API Documentation](https://spinframework.github.io/spin-python-sdk/v4/index.html)
 
 ## Example
 

examples/streaming/README.md

@@ -28,7 +28,7 @@ spin build --up
 ## Testing the App
 
 ```
-curl -i -H 'content-type: text/plain' --data-binary @- http://127.0.0.1:8080/echo <<EOF
+curl -i -H 'content-type: text/plain' --data-binary @- http://127.0.0.1:3000/echo <<EOF
 ’Twas brillig, and the slithy toves
       Did gyre and gimble in the wabe:
 All mimsy were the borogoves,
@@ -47,7 +47,7 @@ curl -i \
     -H 'url: https://webassembly.github.io/spec/core/' \
     -H 'url: https://www.w3.org/groups/wg/wasm/' \
     -H 'url: https://bytecodealliance.org/' \
-    http://127.0.0.1:8080/hash-all
+    http://127.0.0.1:3000/hash-all
 ```
 
 If you run into any problems, please file an issue!