Format Compatibility Table in README

ref: https://www.tablesgenerator.com/markdown_tables

Author: joelhandwell

README.md

@@ -126,13 +126,13 @@ All APIs and Models' documentation can be found at the [Generated client's READM
 
 ## Compatibility
 
-| client version | Kubernetes 1.4 | Kubernetes 1.5 | Kubernetes 1.6 | Kubernetes 1.7 | Kubernetes 1.8 | Kubernetes 1.9 | Kubernetes 1.10 | Kubernetes 1.11 |
-|-------------------------|----------------|----------------|----------------|----------------|----------------|-----------|-----------|
-| 0.1.0        | +              | +              | ✓              | -              | -              | -         | -        | -        |
-| 0.2.0        | +              | +              | ✓              | -              | -              | -         | -        | -        |
-| 1.0.0        | +              | +              | +              | +              | ✓              | -         | -        | -        |
-| 2.0.0        | +              | +              | +              | +              | +              | +         | ✓        | -        |
-| 3.0.0-beta1  | +              | +              | +              | +              | +              | +         | +        | ✓        |
+|  client version  | 1.4              | 1.5              | 1.6              | 1.7              | 1.8              | 1.9         | 1.10       | 1.11       |
+|------------------|------------------|------------------|------------------|------------------|------------------|-------------|------------|------------|
+|  0.1.0           |  +               |  +               |  ✓               |  -               |  -               |  -          |  -         |  -         |
+|  0.2.0           |  +               |  +               |  ✓               |  -               |  -               |  -          |  -         |  -         |
+|  1.0.0           |  +               |  +               |  +               |  +               |  ✓               |  -          |  -         |  -         |
+|  2.0.0           |  +               |  +               |  +               |  +               |  +               |  +          |  ✓         |  -         |
+|  3.0.0-beta1     |  +               |  +               |  +               |  +               |  +               |  +          |  +         |  ✓         |
 
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