Update README.md and cefclient links

Author: amaitland

.github/ISSUE_TEMPLATE/bug_report.md

@@ -69,8 +69,8 @@ Delete this line and everything above, and then fill in the details below.
 
 - **Does this problem also occur in the `CEF` Sample Application**
     - Download one of the following:
-    - For x86 download https://cef-builds.spotifycdn.com/cef_binary_90.6.5%2Bg7a604aa%2Bchromium-90.0.4430.93_windows32_client.tar.bz2
-    - For x64 download https://cef-builds.spotifycdn.com/cef_binary_90.6.5%2Bg7a604aa%2Bchromium-90.0.4430.93_windows64_client.tar.bz2
+    - For x86 download https://cef-builds.spotifycdn.com/cef_binary_91.1.21%2Bg9dd45fe%2Bchromium-91.0.4472.114_windows32_client.tar.bz2
+    - For x64 download https://cef-builds.spotifycdn.com/cef_binary_91.1.21%2Bg9dd45fe%2Bchromium-91.0.4472.114_windows64_client.tar.bz2
 	- Extract and run cefclient.exe
 		- If you are using WPF/OffScreen run
 		```

CONTRIBUTING.md

@@ -19,8 +19,8 @@ The upstream [`CEF` forum](http://magpcss.org/ceforum/) is a valuable resource,
 It maybe helpful to run the `cefclient` application and compare output with `CefSharp`. The `WinForms` and `WPF` versions use two different rendering modes, `WPF` uses Offscreen Rendering (`OSR`). `OffScreen` also uses `OSR` mode.
 
   - Download one of the following:
-    - For x86 download https://cef-builds.spotifycdn.com/cef_binary_90.6.5%2Bg7a604aa%2Bchromium-90.0.4430.93_windows32_client.tar.bz2
-    - For x64 download https://cef-builds.spotifycdn.com/cef_binary_90.6.5%2Bg7a604aa%2Bchromium-90.0.4430.93_windows64_client.tar.bz2
+    - For x86 download https://cef-builds.spotifycdn.com/cef_binary_91.1.21%2Bg9dd45fe%2Bchromium-91.0.4472.114_windows32_client.tar.bz2
+    - For x64 download https://cef-builds.spotifycdn.com/cef_binary_91.1.21%2Bg9dd45fe%2Bchromium-91.0.4472.114_windows64_client.tar.bz2
 	- Extract and run cefclient.exe
 		- If you are using WPF/OffScreen run
 		```

README.md

@@ -87,9 +87,9 @@ If you're new to `CefSharp` and are downloading the source to check it out, plea
 
 | Branch                                                               | CEF Version  | VC++ Version | .Net Version | Status |
 |----------------------------------------------------------------------|------|-------|---------|-----------------|
-| [master](https://github.com/cefsharp/CefSharp/)                      | 4472 | 2015* | 4.5.2** | Development     |
-| [cefsharp/91](https://github.com/cefsharp/CefSharp/tree/cefsharp/91) | 4472 | 2015* | 4.5.2** | **Pre-Release** |
-| [cefsharp/90](https://github.com/cefsharp/CefSharp/tree/cefsharp/90) | 4430 | 2015* | 4.5.2** | **Release**     |
+| [master](https://github.com/cefsharp/CefSharp/)                      | 4515 | 2015* | 4.5.2** | Development     |
+| [cefsharp/91](https://github.com/cefsharp/CefSharp/tree/cefsharp/91) | 4472 | 2015* | 4.5.2** | **Release**     |
+| [cefsharp/90](https://github.com/cefsharp/CefSharp/tree/cefsharp/90) | 4430 | 2015* | 4.5.2** | Unsupported     |
 | [cefsharp/89](https://github.com/cefsharp/CefSharp/tree/cefsharp/89) | 4389 | 2015* | 4.5.2** | Unsupported     |
 | [cefsharp/88](https://github.com/cefsharp/CefSharp/tree/cefsharp/88) | 4324 | 2015* | 4.5.2** | Unsupported     |
 | [cefsharp/87](https://github.com/cefsharp/CefSharp/tree/cefsharp/87) | 4280 | 2015* | 4.5.2** | Unsupported     |