Bump drift-rs version (#86)

* Bump drift-rs v1.0.0-alpha.2
* gateway makes minimal network subscriptions by default
* Add '--markets' for user to supply intended markets. market + oracle subs are created from this
* update README

Author: jordy25519

.github/workflows/build.yml

@@ -58,4 +58,4 @@ jobs:
         run: |
           cargo -V
           cp libdrift_ffi_sys.so ./target/debug/deps
-          cargo test --all -- --test-threads=2
+          cargo test --all -- --test-threads=3