Fix logo on PyPI and add badge

README.md

@@ -1,6 +1,8 @@
 # Xee: Xarray + Google Earth Engine
 
-![Xee Logo](docs/xee-logo.png)
+[![image](https://img.shields.io/pypi/v/xee.svg)](https://pypi.python.org/pypi/xee)
+
+![Xee Logo](https://raw.githubusercontent.com/google/Xee/main/docs/xee-logo.png)
 
 _An Xarray extension for Google Earth Engine._
 
@@ -84,4 +86,4 @@ distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
-```
+```