Bumped version.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>

HISTORY.rst

@@ -2,8 +2,8 @@
 History
 =======
 
-1.9.0 (coming soon)
--------------------
+1.9.0 (2023-05-04)
+------------------
 
 * Re-implemented interpolation of tie point attributes into space (!23).
   Three techniques are now supported: RBF, GPR, and Ordinary Kriging. Added scikit-learn to dependencies.

arosics/version.py

@@ -24,5 +24,5 @@
 # limitations under the License.
 
 
-__version__ = '1.8.1'
-__versionalias__ = '2023-03-10_01'
+__version__ = '1.9.0'
+__versionalias__ = '2023-05-04_01'