Fixes project configuration error for MacOS systems

The name of the Gecko driver was incorrect for MacOS systems, as the
prefix used was "mac" instead of "macos". This commit changes the prefix
to solve this problem.

Thanks to Ivan Ferrant (iferrant) for this fix.

pom.xml

@@ -4,7 +4,7 @@
 	<groupId>es.uvigo.esei.daa</groupId>
 	<artifactId>example</artifactId>
 	<packaging>war</packaging>
-	<version>0.1.7</version>
+	<version>0.1.8</version>
 	<name>DAA Example</name>
 
 	<licenses>
@@ -718,7 +718,7 @@
 				</os>
 			</activation>
 			<properties>
-				<geckodriver.suffix>mac</geckodriver.suffix>
+				<geckodriver.suffix>macos</geckodriver.suffix>
 				<geckodriver.url>https://github.com/mozilla/geckodriver/releases/download/${geckodriver.version}/geckodriver-${geckodriver.version}-${geckodriver.suffix}.tar.gz</geckodriver.url>
 				<geckodriver.basepath>${settings.localRepository}${file.separator}geckodriver${file.separator}${os.name}${file.separator}${os.arch}</geckodriver.basepath>
 				<geckodriver.compressed.path>${geckodriver.basepath}${file.separator}geckodriver-${geckodriver.version}-${geckodriver.suffix}.tar.gz</geckodriver.compressed.path>