make the last example run

Solved this error:

```
thread '<main>' panicked at 'called `Result::unwrap()` on an `Err` value: Parse(LocatableError { record: 5, field: 1, err: UnequalLengths { expected: 3, got: 1 } })', ../src/libcore/result.rs:785
note: Run with `RUST_BACKTRACE=1` for a backtrace.
error: Process didn't exit successfully: `target/debug/stridist` (exit code: 101)
```

README.md

@@ -175,28 +175,27 @@ use std::io::{self, Write};
 use csv::index::{Indexed, create_index};
 
 fn main() {
- let data = "
- h1,h2,h3
- a,b,c
- d,e,f
- g,h,i
- ";
+ let data = "
+h1,h2,h3
+a,b,c
+d,e,f
+g,h,i";
 
- let new_csv_rdr = || csv::Reader::from_string(data);
+  let new_csv_rdr = || csv::Reader::from_string(data);
 
- let mut index_data = io::Cursor::new(Vec::new());
- create_index(new_csv_rdr(), index_data.by_ref()).unwrap();
- let mut index = Indexed::open(new_csv_rdr(), index_data).unwrap();
+  let mut index_data = io::Cursor::new(Vec::new());
+  create_index(new_csv_rdr(), index_data.by_ref()).unwrap();
+  let mut index = Indexed::open(new_csv_rdr(), index_data).unwrap();
 
- // Seek to the second record and read its data. This is done *without*
- // reading the first record.
- index.seek(1).unwrap();
+  // Seek to the second record and read its data. This is done *without*
+  // reading the first record.
+  index.seek(1).unwrap();
 
- // Read the first row at this position (which is the second record).
- // Since `Indexed` derefs to a `csv::Reader`, we can call CSV reader methods
- // on it directly.
- let row = index.records().next().unwrap().unwrap();
+  // Read the first row at this position (which is the second record).
+  // Since `Indexed` derefs to a `csv::Reader`, we can call CSV reader methods
+  // on it directly.
+  let row = index.records().next().unwrap().unwrap();
 
- assert_eq!(row, vec!["d", "e", "f"]);
+  assert_eq!(row, vec!["d", "e", "f"]);
 }
 ```