fix readme

Author: fx-kirin

Diff for: README.md

@@ -5,9 +5,12 @@
 ## Usage
 
 ```
-mt4_hst.read_hst(hst_file_path)
+import mt4_hst
+df = mt4_hst.read_hst('pass to hst file')
 ```
 
+This method returns `pandas.DataFrame`.
+
 ## Installation
 
 ```

Diff for: mt4_hst/__init__.py

@@ -21,6 +21,5 @@ def read_hst(filepath):
             dtype = [('time', 'u8'), ('open', 'f8'), ('high', 'f8'), ('low', 'f8'),
                      ('close', 'f8'), ('volume', 'i8'), ('s', 'i4'), ('r', 'i8')]
             df = pd.DataFrame(np.frombuffer(f.read(), dtype=dtype).astype(dtype[:-2]))
-        df['time'] = df['time']
         df['time'] = pd.to_datetime(df['time'], unit='s')
     return df

Diff for: setup.py

@@ -27,7 +27,7 @@ def get_requires():
 
 setup(
     name="mt4_hst",
-    version="0.1.0",
+    version="0.1.2",
     url="https://github.com/fx-kirin/mt4_hst",
     license='MIT',