Add Proguard 7.0.0 to third_party.

Change-Id: I9d8b6fd6cc9e374b1cbbaf7e43bd83f22978c1b7
diff --git a/build.gradle b/build.gradle
index 4428f58..693cdba 100644
--- a/build.gradle
+++ b/build.gradle
@@ -334,6 +334,7 @@
                 "openjdk/jdk-11-test",
                 "proguard/proguard5.2.1",
                 "proguard/proguard6.0.1",
+                "proguard/proguard-7.0.0",
                 "r8",
                 "r8-releases/2.0.74",
                 "r8mappings",
diff --git a/third_party/proguard/README.google b/third_party/proguard/README.google
index abe0568..714899c 100644
--- a/third_party/proguard/README.google
+++ b/third_party/proguard/README.google
@@ -1,8 +1,9 @@
 URL: https://sourceforge.net/projects/proguard/files/proguard/5.2/
 URL: https://sourceforge.net/projects/proguard/files/proguard/6.0/
-Version: 5.2.1, 6.0.1
+URL: https://github.com/Guardsquare/proguard/releases/download/v7.0.0/proguard-7.0.0.tar.gz
+Version: 5.2.1, 6.0.1, 7.0.0
 License: GPL
-License File: proguard5.2.1/docs/license.html, proguard6.0.1/docs/license.html
+License File: proguard5.2.1/docs/license.html, proguard6.0.1/docs/license.html, proguard-7.0.0/docs/license.md
 
 Description:
 ProGuard Java Optimizer and Obfuscator
diff --git a/third_party/proguard/proguard-7.0.0.tar.gz.sha1 b/third_party/proguard/proguard-7.0.0.tar.gz.sha1
new file mode 100644
index 0000000..eb88ebe
--- /dev/null
+++ b/third_party/proguard/proguard-7.0.0.tar.gz.sha1
@@ -0,0 +1 @@
+96b54d82acbf8ccdf53fdc5ea95f65907e526fca
\ No newline at end of file