lower random-example's difficulty for CI

README.md

@@ -1,5 +1,5 @@
 # [WordCloud.jl](https://github.com/guo-yong-zhi/WordCloud.jl)
-[![CI](https://github.com/guo-yong-zhi/WordCloud.jl/actions/workflows/ci.yml/badge.svg)](https://github.com/guo-yong-zhi/WordCloud.jl/actions/workflows/ci.yml) [![CI-nightly](https://github.com/guo-yong-zhi/WordCloud.jl/actions/workflows/ci-nightly.yml/badge.svg)](https://github.com/guo-yong-zhi/WordCloud.jl/actions/workflows/ci-nightly.yml) [![codecov](https://codecov.io/gh/guo-yong-zhi/WordCloud.jl/branch/main/graph/badge.svg?token=43TOrL25V7)](https://codecov.io/gh/guo-yong-zhi/WordCloud.jl)  
+[![CI](https://github.com/guo-yong-zhi/WordCloud.jl/actions/workflows/ci.yml/badge.svg)](https://github.com/guo-yong-zhi/WordCloud.jl/actions/workflows/ci.yml) [![CI-nightly](https://github.com/guo-yong-zhi/WordCloud.jl/actions/workflows/ci-nightly.yml/badge.svg)](https://github.com/guo-yong-zhi/WordCloud.jl/actions/workflows/ci-nightly.yml) [![codecov](https://codecov.io/gh/guo-yong-zhi/WordCloud.jl/branch/master/graph/badge.svg?token=2U0X769Z51)](https://codecov.io/gh/guo-yong-zhi/WordCloud.jl)  
 ![juliadoc](res/juliadoc.png)  
  Word cloud (tag cloud or wordle) is a novelty visual representation of text data. The importance of each word is shown with font size or color. Our generator has the following highlights:
 * **Flexible** Any mask, any color, any angle, adjustable density. You can specify the initial position of some words. Or you can pin some words and adjust others, etc.

examples/random.jl

@@ -1,6 +1,9 @@
 using WordCloud
 using Random
 
-words = [Random.randstring(rand(1:8)) for i in 1:500]
+words = [Random.randstring(rand(1:8)) for i in 1:300]
 weights = randexp(length(words)) .* 2000 .+ rand(20:100, length(words));
-wc = wordcloud(words, weights, mask=shape(ellipse, 500, 500, color=0.15), angles=(0,90,45)) |> generate!
+wc = wordcloud(words, weights, 
+    mask=shape(ellipse, 500, 500, color=0.15),
+    density=0.5,
+    angles=(0,90,45)) |> generate!