Update changelog and version

Author: mole99

Changelog.md

@@ -1,3 +1,19 @@
+# 2.5.4
+
+## Common
+
+- `ngspice` tool:
+  - Add `jobs` argument
+  - Add `spiceinit_path` argument
+  - By default copy the PDK spiceinit to the simulation directory
+- `klayout_drc` tool:
+  - Add `jobs` argument
+  - Add `drc_script_path` argument
+- Reserved variables:
+  - Add `CACE{jobs}`
+  - Add `CACE{root}`
+- Issue a warning when a conditions has the same name as a reserved variable
+
 # 2.5.3
 
 ## Common

cace/__version__.py

@@ -11,7 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-__version__ = '2.5.3'
+__version__ = '2.5.4'
 
 if __name__ == '__main__':
     print(__version__, end='')