modified:   .gitignore
modified:   README.md
modified:   src/main/java/org/effectivejava/examples/chapter03/item08/composition/ColorPoint.java
modified:   src/main/java/org/effectivejava/examples/chapter03/item09/PhoneNumber.java
modified:   src/main/java/org/effectivejava/examples/chapter03/item12/PhoneNumber.java