Update README

Author: devmotion

README.md

@@ -2,13 +2,8 @@
 
 <div align="center"><img src="https://rawgit.com/JuliaMath/Tau.jl/master/tau-2pi.svg" width="300"/></div><br/><br/>
 
-[![travis][travis-img]](https://travis-ci.org/JuliaMath/Tau.jl)
-[![appveyor][appveyor-img]](https://ci.appveyor.com/project/waldyrious/tau-jl)
-[![codecov][codecov-img]](http://codecov.io/github/JuliaMath/Tau.jl)
-
-[travis-img]: https://img.shields.io/travis/JuliaMath/Tau.jl/master.svg?label=Linux,%20macOS
-[appveyor-img]: https://img.shields.io/appveyor/ci/waldyrious/tau-jl/master.svg?label=Windows
-[codecov-img]: https://img.shields.io/codecov/c/github/JuliaMath/Tau.jl/master.svg?label=coverage
+[![CI](https://github.com/JuliaMath/Tau.jl/actions/workflows/CI.yml/badge.svg?branch=master)](https://github.com/JuliaMath/Tau.jl/actions/workflows/CI.yml?query=branch%3Amaster)
+[![codecov](https://img.shields.io/codecov/c/github/JuliaMath/Tau.jl/master.svg?label=coverage)](http://codecov.io/github/JuliaMath/Tau.jl)
 
 This [Julia](https://github.com/JuliaLang/julia) [package](http://pkg.julialang.org/)
 defines the [Tau](http://www.tauday.com/tau-manifesto) constant
@@ -23,21 +18,32 @@ tau ≈ 2*pi
 After installing this package with `Pkg.add("Tau")`, it can be used as follows:
 
 ```julia
-using Tau
+julia> using Tau
+
+julia> tau === τ ≈ 2*pi
+true
 
-tau == τ ≈ 2*pi  # => true
-typeof(tau)      # => Irrational{:τ}
+julia> typeof(tau)
+Irrational{:twoπ}
 ```
 
 Note: to input the τ character, type `\tau` then press <kbd>Tab</kbd>.
 
 The tau variants of `sinpi`, `cospi`, and `mod2pi` are also defined:
 
 ```julia
-sintau(1//4) # => 1.0
-costau(1//2) # => -1.0
+julia> sintau(1//4)
+1.0
+
+julia> costau(1//2)
+-1.0
+
+julia> modtau(9*pi/4)
+0.7853981633974481
 ```
 
+Alternatively, one can use the Unicode aliases `sinτ`, `cosτ`, and `modτ`.
+
 ## The tau != 2pi inequality
 
 When this package was first created, the equality `tau == 2pi` did hold true,