Bump versions and prepare for release (#50)

This commit updates the version numbers and package metadata to prepare
for the next release.

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "retworkx"
 description = "A python graph library implemented in Rust"
-version = "0.3.2"
+version = "0.3.3"
 authors = ["Matthew Treinish <[email protected]>"]
 license = "Apache-2.0"
 readme = "README.md"

setup.py

@@ -16,16 +16,16 @@ def readme():
 
 setup(
     name="retworkx",
-    version="0.3.2",
+    version="0.3.3",
     description="A python graph library implemented in Rust",
     long_description=readme(),
     long_description_content_type='text/markdown',
     author="Matthew Treinish",
     author_email="[email protected]",
     classifiers=[
         "License :: OSI Approved :: Apache Software License",
-        "Development Status :: 3 - Alpha",
         "Intended Audience :: Developers",
+        "Intended Audience :: Science/Research",
         "Programming Language :: Rust",
         "Programming Language :: Python :: 3 :: Only",
         "Programming Language :: Python :: 3.5",
@@ -36,6 +36,7 @@ def readme():
         "Operating System :: Microsoft :: Windows",
         "Operating System :: POSIX :: Linux",
     ],
+    keywords="Networks network graph Graph Theory DAG",
     url="https://github.com/Qiskit/retworkx",
     project_urls={
         "Bug Tracker": "https://github.com/Qiskit/retworkx/issues",