Upgrades to JDK 20, JUnit 5.10, and links to demo

README.md

		KeenQuotes converts straight quotes into curly quotes.

		+# Demo
		+
		+Try the [demo](https://whitemagicsoftware.com/keenquotes/)!
		+
		# Requirements

		-Download and install JRE 19:
		+Download and install JRE 20:

		-* [Java 19](https://bell-sw.com/pages/downloads) or newer.
		+* [Java 20](https://bell-sw.com/pages/downloads) or newer.

		# Download

		Run the software from the command-line as follows:

		- java -jar keenquotes.jar < src.txt > dst.txt 2> err.txt
		+``` bash
		+java -jar keenquotes.jar < src.txt > dst.txt 2> err.txt
		+```

		Where:

		* `src.txt` -- Input document file that contains straight quotes.
		* `dst.txt` -- Output document file that'll contain curled quotes.
		* `err.txt` -- Error file that will note ambiguous conversion errors.

		For help, run the software as follows:

		- java -jar keenquotes.jar -h
		+``` bash
		+java -jar keenquotes.jar -h
		+```

		# Software Design

build.gradle

		implementation 'info.picocli:picocli:4.7.4'

		- testImplementation 'org.junit.jupiter:junit-jupiter-api:5.9.0'
		- testImplementation 'org.junit.jupiter:junit-jupiter-params:5.9.0'
		+ testImplementation 'org.junit.jupiter:junit-jupiter-api:5.10.0'
		+ testImplementation 'org.junit.jupiter:junit-jupiter-params:5.10.0'
		testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine'
		}

		compileJava {
		options.compilerArgs << "-Xlint:unchecked" << "-Xlint:deprecation"
		- options.compilerArgs.addAll(['--release', '19'])
		+ options.compilerArgs.addAll(['--release', '20'])
		}

Delta	15 lines added, 7 lines removed, 8-line increase