Fix Julia prompt in Readme (#278)

* Fix Julia prompt in Readme

minor fix to include the julia prompt in one example

* Make table of badges more compact

Change from a single-line to a multiline table

Author: jishnub

README.md

@@ -1,8 +1,9 @@
 # OffsetArrays.jl
 
-| Documentation (stable) | Documentation (dev) |  Unit Tests | Code coverage | PkgEval |
-| :-: | :-: | :-: | :-: | :-: |
-| [![][docs-stable-img]][docs-stable-url] |  [![][docs-dev-img]][docs-dev-url] | [![][action-img]][action-url] | [![][codecov-img]][codecov-url] | [![][pkgeval-img]][pkgeval-url] |
+| Documentation |  Build Status | Code coverage |
+| :-: | :-: | :-: |
+| [![][docs-stable-img]][docs-stable-url] |  [![][action-img]][action-url] | [![][codecov-img]][codecov-url] |
+| [![][docs-dev-img]][docs-dev-url]  |  [![][pkgeval-img]][pkgeval-url] | |
 
 ## Introduction
 
@@ -28,7 +29,8 @@ where you want `OA` to have axes `(axis1, axis2, ...)` and be indexed by values
 fall within these axis ranges. Example:
 
 ```julia
-using OffsetArrays
+julia> using OffsetArrays
+
 julia> A = Float64.(reshape(1:15, 3, 5))
 3×5 Matrix{Float64}:
  1.0  4.0  7.0  10.0  13.0
@@ -44,10 +46,10 @@ julia> OA = OffsetArray(A, -1:1, 0:4) # OA will have the axes (-1:1, 0:4)
  2.0  5.0  8.0  11.0  14.0
  3.0  6.0  9.0  12.0  15.0
 
-julia> OA[-1,0]
+julia> OA[-1, 0]
 1.0
 
-julia> OA[1,4]
+julia> OA[1, 4]
 15.0
 ```