remove tango dependency because it already added by inheritance

pom.xml

@@ -8,7 +8,7 @@
    </parent>
    <groupId>fr.soleil.lib</groupId>
    <artifactId>Electrometers-${aol}-${library}-${mode}</artifactId>
-   <version>2.3.0</version>
+   <version>2.3.1</version>
    <packaging>nar</packaging>
    <name>Electrometers library</name>
    <description>Electrometers library</description>
@@ -33,9 +33,5 @@
        </plugins>
    </build>
    <dependencies>
-       <dependency>
-           <groupId>org.tango</groupId>
-           <artifactId>tango-cpp-api</artifactId>
-       </dependency>
    </dependencies>
 </project>