Turbine 0.8.0

Changes:

• Handle sealed types with implicitly permitted types (0c6eb49)
• Fix a bug in where java.base was added to the module graph of java.base itself (ffafaff)
• Improve modeling of parameterized erroneous types, similar to improvements made to javac in JDK-8338678 (99442e8)
• Implement TypeElement#getPermittedSubclasses
• Support sealed and non-sealed modifiers in Element#getModifiers
• Fix parsing of module-info require directives that are both static and transitive (e1ea3c5)

Full changelog: v0.7.0...v0.8.0