update README.md and README_cn.md

README.md

@@ -33,7 +33,7 @@ To avoid the trouble of environment setup, [running in Docker container](#runnin
 - Make sure these libraries or tools installed: `pkg-config`, `flac`, `ogg`, `vorbis`, `boost` and `swig`, e.g. installing them via `apt-get`:
 
 ```bash
-sudo apt-get install -y pkg-config libflac-dev libogg-dev libvorbis-dev libboost-dev swig
+sudo apt-get install -y pkg-config libflac-dev libogg-dev libvorbis-dev libboost-dev swig python-dev
 ```
 
 or, installing them via `yum`:
@@ -139,7 +139,7 @@ python tools/compute_mean_std.py \
 --output_path data/librispeech/mean_std.npz
 ```
 
-It will compute the mean and standard deviation of power spectrum feature with 2000 random sampled audio clips listed in `data/librispeech/manifest.train` and save the results to `data/librispeech/mean_std.npz` for further usage.
+It will compute the mean and standard deviatio of power spectrum feature with 2000 random sampled audio clips listed in `data/librispeech/manifest.train` and save the results to `data/librispeech/mean_std.npz` for further usage.
 
 
 ### Build Vocabulary

README_cn.md

@@ -31,13 +31,13 @@
 - 请确保以下库或工具已安装完毕：`pkg-config`, `flac`, `ogg`, `vorbis`, `boost` 和 `swig`, 如可以通过`apt-get`安装：
 
 ```bash
-sudo apt-get install -y pkg-config libflac-dev libogg-dev libvorbis-dev libboost-dev swig
+sudo apt-get install -y pkg-config libflac-dev libogg-dev libvorbis-dev libboost-dev swig python-dev
 ```
 
 或者，也可以通过`yum`安装：
 
 ```bash
-sudo yum install pkgconfig libogg-devel libvorbis-devel boost-devel
+sudo yum install pkgconfig libogg-devel libvorbis-devel boost-devel python-devel
 wget https://ftp.osuosl.org/pub/xiph/releases/flac/flac-1.3.1.tar.xz
 xz -d flac-1.3.1.tar.xz
 tar -xvf flac-1.3.1.tar
@@ -133,7 +133,7 @@ sh setup.sh
 python tools/compute_mean_std.py \
 --num_samples 2000 \
 --specgram_type linear \
---manifest_paths data/librispeech/manifest.train \
+--manifest_path data/librispeech/manifest.train \
 --output_path data/librispeech/mean_std.npz
 ```