Update README.md

README.md

@@ -1,4 +1,4 @@
-[![AppVeyor Build status](https://ci.appveyor.com/api/projects/status/k7j5d9v81qjm69j6?svg=true)](https://ci.appveyor.com/project/jianboqi/lessrt)
+[![AppVeyor Build status](https://ci.appveyor.com/api/projects/status/github/jianboqi/lessrt?branch=master&svg=true)](https://ci.appveyor.com/project/jianboqi/lessrt)
 
 LESS is a 3D radiative transfer model which can simulate large-scale spectral images and remote sensing data.
 
@@ -36,5 +36,4 @@ but the packaging into a simple installer is not finished. We are working on tha
 ## For developers
 The whole model (including GUI) is written with C++, Python and JavaFX. JavaFX is responsible for GUI, and Python is used to develop all util tools (e.g., image format conversion), since it has numerious of  third-party libraries available. C++ is for writting calculating radiative transfer Core for high performance, and this part is mainly based on an open source renderer [Mitsuba](https://www.mitsuba-renderer.org/). Mitsuba provides an flexible framwork to develop customer plugins and do parallel computing.
 
-The basic relationship between all these components (GUI, Radiative Transfer Core and tools) are as follow: