update readme

README.md

@@ -14,10 +14,8 @@ extern crate rocksdb;
 use rocksdb::RocksDB;
 
 fn main() {
-  match RocksDB::open_default("/path/for/rocksdb/storage") {
-    Ok(db) => {
+    let db = RocksDB::open_default("/path/for/rocksdb/storage").unwrap;
     db.put(b"my key", b"my value");
-
     db.get(b"my key").map( |value| {
         match value.to_utf8() {
             Some(v) =>
@@ -30,11 +28,7 @@ fn main() {
         .on_error( |e| { println!("error retrieving value: {}", e) });
 
     db.delete(b"my key");
-
     db.close();
-    },
-    Err(e) => panic!(e),
-  }
 }
 ```
 
@@ -43,7 +37,7 @@ fn main() {
   - [x] linux support
   - [x] rocksdb compiled via cargo
   - [x] OSX support
-  - [ ] rustic merge operator
+  - [x] rustic merge operator
   - [ ] batch
   - [ ] iterator
   - [ ] range