compliant with PyPi repository

.gitignore

@@ -5,3 +5,5 @@ __pycache__
 pcb_tools_extension.egg-info
 test
 outputs
+build
+dist

README.md

@@ -13,10 +13,8 @@ pcb-tools-extension adds following function  to pcb-tools.
 Only RS-274x format and Excellon drill format data can be handled by current version of this library.
 
 ## Install
-pcb-tools-extension is not registerd to PyPI repository.<br>
-Please install from GitHub repository as below.
 ```shell
-$ pip install git+https://github.com/opiopan/pcb-tools-extension
+$ pip install pcb-tools-extension
 ```
 
 ## How to panelize
@@ -137,10 +135,10 @@ ctx.dump('merged_drill.txt')
 ```
 
 ## Panelizing Example
-This example board image is generated by following scripts from [these source data](examples/inputs).
+This example board image is generated by following scripts from [these source data](https://github.com/opiopan/pcb-tools-extension/tree/master/examples/inputs).
 
-- [panelizing script](examples/panelize.py)
-- [imaging script](examples/genimage.py)
+- [panelizing script](https://github.com/opiopan/pcb-tools-extension/blob/master/examples/panelize.py)
+- [imaging script](https://github.com/opiopan/pcb-tools-extension/blob/master/examples/genimage.py)
 
 <p align="center">
 <img alt="description" src="https://raw.githubusercontent.com/wiki/opiopan/pcb-tools-extension/images/panelized.jpg" width=750>

setup.py

@@ -19,15 +19,15 @@ METADATA = {
     'url': "http://github.com/opiopan/pcb-tools-extension",
     'packages': ['gerberex'],
     'long_description': read('README.md'),
-    'classifiers':[
+    'long_description_content_type': 'text/markdown', 
+    'classifiers': [
         "Development Status :: 3 - Alpha",
         "Topic :: Utilities",
         "License :: OSI Approved :: Apache Software License",
-        "Programming Language:: Python:: 2",
         'Programming Language :: Python :: 2.7',
-        'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.3',
-        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
     ],
 }