Update copyright years (#3612)

Author: chanseokoh

features/com.google.licenses.apache_v2/feature.properties

@@ -1,6 +1,6 @@
 copyright.url = http://www.google.com/intl/en/about.html
 copyright.text =\
-Copyright 2016-2019 Google LLC\n
+Copyright 2016-2020 Google LLC\n
 # End copyright.text
 
 license.url = http://www.apache.org/licenses/LICENSE-2.0

gcp-repo/metadata.p2.inf

@@ -36,7 +36,7 @@ units.1.properties.5.name=org.eclipse.equinox.p2.doc.url
 units.1.properties.5.value=https://cloud.google.com/eclipse/docs/
 units.1.properties.6.name=org.eclipse.equinox.p2.description
 units.1.properties.6.value=Supports development of Google Cloud Platform projects in Eclipse.
-units.1.copyright =Copyright 2016-2019 Google LLC
+units.1.copyright =Copyright 2016-2020 Google LLC
 units.1.licenses.0 =\
 Cloud Tools for Eclipse is made available under the Apache License, Version 2.0. \
 Please visit the following URL for details:\n\n\

plugins/com.google.cloud.tools.eclipse.ui.test/src/com/google/cloud/tools/eclipse/ui/AboutIniTest.java

@@ -47,7 +47,7 @@ public void testAboutText() {
         "Google Cloud Tools for Eclipse\n"
             + "Version: {featureVersion}\n"
             + "\n"
-            + "Copyright 2016-2019 Google LLC\n"
+            + "Copyright 2016-2020 Google LLC\n"
             + "\n"
             + "Cloud Tools for Eclipse is a Google-sponsored plugin that adds "
             + "support for App Engine, Cloud Dataflow, and other parts of "

plugins/com.google.cloud.tools.eclipse.ui/about.properties

@@ -1,7 +1,7 @@
 blurb=Google Cloud Tools for Eclipse\n\
 Version: {featureVersion}\n\
 \n\
-Copyright 2016-2019 Google LLC\n\
+Copyright 2016-2020 Google LLC\n\
 \n\
 Cloud Tools for Eclipse is a Google-sponsored plugin that adds \
 support for App Engine, Cloud Dataflow, and other parts of \