Update README.md

Author: nikolaydubina

README.md

@@ -8,19 +8,19 @@ $ go test -coverprofile cover.out ./...
 $ go-cover-heatmap -coverprofile cover.out > out.svg
 ```
 
-`github.com/gohugoio/hugo`
+_<p align="center">github.com/gohugoio/hugo</p>_
 ![example-hugo](docs/hugo.svg)
 
-`github.com/gin-gonic/gin`
+_<p align="center">github.com/gin-gonic/gin</p>_
 ![example-gin](docs/gin.svg)
 
-`github.com/go-chi/chi`
+_<p align="center">github.com/go-chi/chi</p>_
 ![example-chi](docs/chi.svg)
 
-`github.com/nikolaydubina/treemap`
+_<p align="center">github.com/nikolaydubina/treemap</p>_
 ![example-treemap](docs/go-cover-treemap.svg)
 
-`github.com/nikolaydubina/go-featureprocessing`
+_<p align="center">github.com/nikolaydubina/go-featureprocessing</p>_
 ![example-go-featureprocessing](docs/go-featureprocessing.svg)
 
 ## Disclaimer
@@ -39,4 +39,4 @@ Welcomed! Add pretty color palettes! Add interesting examples!
 
 * Official Go tool to make HTML from cover profile: https://github.com/golang/go/blob/master/src/cmd/cover/html.go#L97
 * Official Go parser of cover profile `golang.org/x/tools/cover`: https://github.com/golang/tools/tree/master/cover
-* Go SVG Treemap renderer with heatmap: github.com/nikolaydubina/treemap
+* Go SVG Treemap renderer with heatmap: github.com/nikolaydubina/treemap