fixed broken readme links after master => main switch

Author: eberthold

readme.md

@@ -12,12 +12,12 @@ Currently its only shows warnings generated by VisualStudio and Roslyn Analyzers
 In addition it features a overall indicator, if your file is good, has warnings or errors.
 Inside this indicator it informs you about the count of elements (fields, methods, properties) in your code. That count is purely informational without judgement on your code ;)
 
-<img src="https://github.com/eberthold/SteroidsVS/blob/master/Screenshots/QualityHints_Dark.PNG?raw=true" height="200"/><img src="https://github.com/eberthold/SteroidsVS/blob/master/Screenshots/QualityHints_Light.PNG?raw=true" height="200"/>
+<img src="https://github.com/eberthold/SteroidsVS/blob/main/Screenshots/QualityHints_Dark.PNG?raw=true" height="200"/><img src="https://github.com/eberthold/SteroidsVS/blob/main/Screenshots/QualityHints_Light.PNG?raw=true" height="200"/>
 
 __Code Structure__
 
 The code structure helps to navigate through large files quickly by listing all elements grouped - as recommended from StyleCop - and alphabetically ordered per group.
 
 The shortcut is defaulted to ctrl-e + ctrl-s or simply click on the quality indicator in the bottom right corner.
 
-<img src="https://github.com/eberthold/SteroidsVS/blob/master/Screenshots/CodeStructure_Dark.PNG?raw=true" width="600" /><img src="https://github.com/eberthold/SteroidsVS/blob/master/Screenshots/CodeStructure_Light.PNG?raw=true" width="600" />
+<img src="https://github.com/eberthold/SteroidsVS/blob/main/Screenshots/CodeStructure_Dark.PNG?raw=true" width="600" /><img src="https://github.com/eberthold/SteroidsVS/blob/main/Screenshots/CodeStructure_Light.PNG?raw=true" width="600" />