Update ahat version number to 1.7.2

Test: atest ahat-tests # SiteTest#objectsAllocatedAtKnownSites known failure
Test: open heap dump and verify version number on overview page.
Bug: 221097419
Change-Id: I35d95a37ce07d2967ea104265656283be805bfa7
diff --git a/tools/ahat/README.txt b/tools/ahat/README.txt
index 1010e9d..da97c10 100644
--- a/tools/ahat/README.txt
+++ b/tools/ahat/README.txt
@@ -51,7 +51,14 @@
 Reported Issues:
  * Request to be able to sort tables by size.
 
+Known Issues:
+ * Line number decoding for allocations in proguarded classes.
+
 Release History:
+ 1.7.2 March 2, 2022
+   Fix ahat parsing to allow leading whitespaces for comments.
+   Hide Value class constructor.
+
  1.7.1 September 30, 2020
    Fix issue parsing proguard maps with comments.
 
diff --git a/tools/ahat/etc/ahat.mf b/tools/ahat/etc/ahat.mf
index eedf4f0..53bb4ac 100644
--- a/tools/ahat/etc/ahat.mf
+++ b/tools/ahat/etc/ahat.mf
@@ -1,4 +1,4 @@
 Name: ahat/
 Implementation-Title: ahat
-Implementation-Version: 1.7.1
+Implementation-Version: 1.7.2
 Main-Class: com.android.ahat.Main