fix a few details and release

Author: orsinium

dephell_setuptools/__init__.py

@@ -9,7 +9,7 @@
 from ._static import StaticReader
 
 
-__version__ = '0.1.2'
+__version__ = '0.2.1'
 
 
 __all__ = [

dephell_setuptools/_cmd.py

@@ -46,7 +46,7 @@ def content(self) -> Dict[str, Any]:
                 env={'PYTHONPATH': str(Path(__file__).parent.parent)},
             )
         if result.returncode != 0:
-            raise RuntimeError(result.stderr.decode().split('\n')[-1])
+            raise RuntimeError(result.stderr.decode().strip().split('\n')[-1])
 
         with open(output_json.name) as stream:
             content = json.load(stream)

dephell_setuptools/_constants.py

@@ -5,6 +5,7 @@
     'author_email',
     'author',
     'classifiers',
+    'dependency_links',
     'description',
     'download_url',
     'extras_require',