v1.4.0

1. Maven:

   <dependencies>
       <dependency>
           <groupId>io.github.problem4j</groupId>
           <artifactId>problem4j-core</artifactId>
           <version>1.4.0</version>
       </dependency>
   </dependencies>

2. Gradle (Kotlin DSL):

   dependencies {
       implementation("io.github.problem4j:problem4j-core:1.4.0")
   }

Added

• Add various static Problem.of(...) factory methods for in-place creation convenience.
• Add support for JSpecify annotations for nullability and Kotlin interop.
• Add support for Java Platform Module System if using Java version 9+, due to producing multi-release JAR artifacts.

  module org.example.project {
      requires io.github.problem4j.core;
  }