Update docs for v2.2.9.1

ChangeLog

@@ -1,5 +1,5 @@
-2020-07-20  Tao Liu  <vladimir.liu@gmail.com>
-   MACS version 2.2.9
+2020-07-21  Tao Liu  <vladimir.liu@gmail.com>
+   MACS version 2.2.9.1
 
    * Bug fix:
 

INSTALL.md

@@ -45,7 +45,7 @@ as described before, your `pip` command will install everything under
 the folder you specified previously through `python3 -m env` command.
 
 Then under the command line, type `pip install macs2`. PyPI will
-install Numpy automatically if it is absent.
+install Cython and Numpy automatically when necessary.
 
 To upgrade MACS2, type `pip install --upgrade macs2`. It will check
 currently installed MACS2, compare the version with the one on PyPI

README.md

@@ -31,9 +31,9 @@ background*.
 *Note: new development on MACS has been moved to MACS3 repository,
 we will only fix installation issues on MACS2.*
 
-## Recent Changes for MACS (2.2.9)
+## Recent Changes for MACS (2.2.9.1)
 
-### 2.2.9
+### 2.2.9.1
     * Bug fix:
      
     Cython has a major upgrade to 3.0, and can't work directly with
@@ -132,9 +132,10 @@ we will only fix installation issues on MACS2.*
 ## Install
 
 Please check the file 'INSTALL.md' in the distribution. In general,
-we can install through PyPI as `pip install macs2` in or not in your
-virtual environment, or we can install after unzipping the released
-package downloaded from Github, then use `pip install .` command.
+you can install through PyPI as `pip install macs2`. To use virtual 
+environment is highly recommended. Or you can install after
+unzipping the released package downloaded from Github, then use 
+`pip install .` command.
 
 ## Usage