POM: Require only Maven 3.8.7, as that's what's in the latest Ubuntu …

…repo.

pom.xml

@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>ch.zizka.csvcruncher</groupId>
     <artifactId>csv-cruncher</artifactId>
-    <version>2.7.2-SNAPSHOT</version>
+    <version>2.8.0</version>
 
     <name>CsvCruncher</name>
     <description>Treats CSV or JSON files as SQL tables, and exports SQL SELECTs back to CSV or JSON.</description>
@@ -14,7 +14,7 @@
     <scm>
         <url>https://github.com/OndraZizka/csv-cruncher</url>
         <developerConnection>scm:git:[email protected]:OndraZizka/csv-cruncher.git</developerConnection>
-        <tag>HEAD</tag>
+        <tag>csv-cruncher-2.8.0</tag>
     </scm>
 
     <properties>
@@ -226,7 +226,7 @@
                         <goals><goal>enforce</goal></goals>
                         <configuration>
                             <rules>
-                                <requireMavenVersion><version>3.9.9</version></requireMavenVersion>
+                                <requireMavenVersion><version>3.8.7</version></requireMavenVersion>
                             </rules>
                         </configuration>
                     </execution>