Update README; mention upgrading pip on failure

Prompted by #231

[skip ci]
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rdb 2018-01-17 10:45:36 +01:00
parent fe3dab192f
commit 8f5d55c539

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@ -28,6 +28,8 @@ into an existing Python installation is using the following command:
pip install --pre --extra-index-url https://archive.panda3d.org/ panda3d
```
If this command fails, please make sure your version of pip is up-to-date.
If you prefer to install the full SDK with all tools, the latest development
builds can be obtained from this page:
@ -51,6 +53,9 @@ depending on whether you are on a 32-bit or 64-bit system:
https://www.panda3d.org/download/panda3d-1.9.4/panda3d-1.9.4-tools-win32.zip
https://www.panda3d.org/download/panda3d-1.9.4/panda3d-1.9.4-tools-win64.zip
(It is also possible to build using MSVC 2015 and 2017, which requires a
different set of thirdparty libraries, but that is not described here.)
After acquiring these dependencies, you may simply build Panda3D from the
command prompt using the following command: