Prepare for release

Author: andrewdalpino

.gitignore

@@ -10,6 +10,7 @@
 *.phc
 *.dSYM
 *.deps
+*.tgz
 
 zephir.phar
 autom4te.cache/

CHANGELOG.md

@@ -1,5 +1,5 @@
 - 2.2.1
-    - Optimize 2D convolution
+    - Optimize 2D convolution operation
     - Fix and optimize vector convolve 1D operation
 
 - 2.2.0

package.xml

@@ -10,18 +10,18 @@
         <email>[email protected]</email>
 		<active>yes</active>
 	</lead>
-	<date>2021-02-28</date>
+	<date>2021-03-07</date>
 	<version>
 		<release>2.2.1</release>
-		<api>2.2.1</api>
+		<api>2.2</api>
 	</version>
 	<stability>
 		<release>stable</release>
 		<api>stable</api>
 	</stability>
 	<license uri="https://github.com/RubixML/Tensor/blob/master/LICENSE">MIT</license>
     <notes>
-        - Optimize 2D convolution
+        - Optimize 2D convolution operation
         - Fix and optimize vector convolve 1D operation
     </notes>
 	<contents>