Fill changelog according to upstream CHANGELOG.md

- Update to version 1.13.0
* Changes in JavaPoet 1.13.0 (2020-06-18)
+ New: Add support for explicit receiver parameters.
+ Fix: Don't copy parameter annotations when creating a
ParameterSpec.
* Changes in JavaPoet 1.12.1 (2020-01-20)
+ Fix: Ignore parameter annotations in MethodSpec.overriding().
* JavaPoet 1.12.0 (2020-01-09)
+ New: Add JavaFile.writeToPath() and JavaFile.writeToFile()
methods that return paths to the generated file as Path and
File respectively.
+ New: Add TypeSpec.alwaysQualify() API to avoid clashes
involving nested type names.
+ New: Add overloads accepting CodeBlocks to MethodSpec's
control flow methods.
+ New: Make list fields of all Builder types mutable.
+ New: Add CodeBlock.clear().
+ New: Allow passing a custom Charset to JavaFile.writeTo().
+ New: Improved performance of ClassName.simpleNames() by
memoizing results.
+ New: Significant performance improvements for
CodeWriter.resolve() as all nested simple names of a TypeSpec
get pre-computed.
+ New: Add TypeName.Builder.setName() to allow overriding names
passed in the constructor.
+ New: Add TypeName.canonicalName().
+ Fix: Use \\R instead of \n as line separator in
CodeWriter.emitAndIndent().
+ Fix: Copy originating elements in TypeSpec.toBuilder().
+ Fix: Ensure trailing newlines in Javadocs and method bodies.
+ Fix: Copy annotations when creating a ParameterSpec from a
VariableElement.
+ Fix: Properly handle classes located in empty packages in
ClassName.
+ Fix: Only allow final modifier on a ParameterSpec.
+ Fix: Use fully-qualified names for type names that are masked
by type variable names.
* Changes in JavaPoet 1.11.1 (2018-05-16)
+ Fix: JavaPoet 1.11 had a regression where TypeName.get()
would throw on error types, masking other errors in an
annotation processing round. This is fixed with a test to
prevent future regressions!
* Changes in JavaPoet 1.11.0 (2018-04-29)
+ New: Support TYPE_USE annotations on each enclosing
ClassName.
+ New: Work around a compiler bug in TypeName.get(TypeElement).
There was a problem getting an element's kind when building
from source ABIs.
* Changes in JavaPoet 1.10.0 (2018-01-27)
+ JavaPoet now requires Java 8 or newer.
+ New: $Z as an optional newline (zero-width space) if a line
may exceed 100 chars.
+ New: CodeBlock.join() and CodeBlock.joining() let you join
codeblocks by delimiters.
+ New: Add CodeBlock.Builder.isEmpty().
+ New: addStatement(CodeBlock) overloads for CodeBlock and
MethodSpec.
+ Fix: Include annotations when emitting type variables.
+ Fix: Use the right imports for annotated type parameters.
+ Fix: Don't incorrectly escape classnames that start with $.
* Changes in JavaPoet 1.9.0 (2017-05-13)
+ Fix: Don't emit incorrect code when the declared type's
signature references another type with the same simple name.
+ Fix: Support anonymous inner classes in ClassName.get().
+ New: MethodSpec.Builder.addNamedCode() and
TypeSpec.anonymousClassBuilder(CodeBlock).
* Changes in JavaPoet 1.8.0 (2016-11-09)
+ New: Basic support for line wrapping. Use $W to insert a
Wrappable Whitespace character. It'll emit either a single
space or a newline with appropriate indentation.
+ New: Named arguments in CodeBlock. These are intended to make
larger code snippets easier to read.
+ New: addJavadoc(CodeBlock) overloads for TypeSpec,
MethodSpec, and FieldSpec.
+ New: MethodSpec.addComment() makes it easy to add a //
single-line comment.
+ New: ClassName.getReflectionName() returns a string like
java.util.Map$Entry.
+ Fix: Always write UTF-8. Previously JavaPoet would use the
system default charset which was potentially inconsistent
across environments.
+ Fix: Permit (constant) fields to be defined in annotation
types.
- Switch to java source level 8
- Initial packaging of javapoet 1.7.0