Build with Tycho 2.0.0

Set min maven version to 3.6.3 as tycho requires it.
Get rid of tycho-extras.version as it's no longer released separately.

Change-Id: I1a416cf6ee21f54b9e480de8b60c76f19ec4ef40
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>
diff --git a/pom.xml b/pom.xml
index 1d4c4dd..148f19c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -19,12 +19,11 @@
   <version>1.0.101-SNAPSHOT</version>
   <packaging>pom</packaging>
   <prerequisites>
-    <maven>3.6.1</maven>
+    <maven>3.6.3</maven>
   </prerequisites>
 
   <properties>
-    <tycho.version>1.6.0</tycho.version>
-    <tycho-extras.version>1.6.0</tycho-extras.version>
+    <tycho.version>2.0.0</tycho.version>
     <cbi-plugins.version>1.1.7</cbi-plugins.version>
     <maven.build.timestamp.format>yyyyMMdd-HHmm</maven.build.timestamp.format>
     <buildTimestamp>${maven.build.timestamp}</buildTimestamp>
@@ -193,7 +192,7 @@
         <plugin>
           <groupId>org.eclipse.tycho.extras</groupId>
           <artifactId>tycho-source-feature-plugin</artifactId>
-          <version>${tycho-extras.version}</version>
+          <version>${tycho.version}</version>
           <configuration>
             <archive>
               <addMavenDescriptor>false</addMavenDescriptor>
@@ -208,12 +207,12 @@
             <dependency>
               <groupId>org.eclipse.tycho.extras</groupId>
               <artifactId>tycho-buildtimestamp-jgit</artifactId>
-              <version>${tycho-extras.version}</version>
+              <version>${tycho.version}</version>
             </dependency>
             <dependency>
               <groupId>org.eclipse.tycho.extras</groupId>
               <artifactId>tycho-sourceref-jgit</artifactId>
-              <version>${tycho-extras.version}</version>
+              <version>${tycho.version}</version>
             </dependency>
           </dependencies>
           <configuration>
@@ -250,7 +249,7 @@
           <plugin>
             <groupId>org.eclipse.tycho.extras</groupId>
             <artifactId>tycho-pack200a-plugin</artifactId>
-            <version>${tycho-extras.version}</version>
+            <version>${tycho.version}</version>
             <executions>
               <execution>
                 <id>pack200-normalize</id>
@@ -278,7 +277,7 @@
           <plugin>
             <groupId>org.eclipse.tycho.extras</groupId>
             <artifactId>tycho-pack200b-plugin</artifactId>
-            <version>${tycho-extras.version}</version>
+            <version>${tycho.version}</version>
             <executions>
               <execution>
                 <id>pack200-pack</id>
@@ -324,7 +323,7 @@
           <plugin>
             <groupId>org.eclipse.tycho.extras</groupId>
             <artifactId>tycho-pack200a-plugin</artifactId>
-            <version>${tycho-extras.version}</version>
+            <version>${tycho.version}</version>
             <executions>
               <execution>
                 <id>pack200-normalize</id>
@@ -337,7 +336,7 @@
           <plugin>
             <groupId>org.eclipse.tycho.extras</groupId>
             <artifactId>tycho-pack200b-plugin</artifactId>
-            <version>${tycho-extras.version}</version>
+            <version>${tycho.version}</version>
             <executions>
               <execution>
                 <id>pack200-pack</id>