Migrate from update-version.sh to update-version.py

The dependency on "sed" causes issues when releasing on MacOS
due to differences in GNU sed / BSD sed. Now we only run python.

scripts/update-version.py

@@ -0,0 +1,51 @@
+#!/usr/bin/python
+
+PREVIOUS_VERSION='3.0.0-rc.2'
+NEXT_VERSION='3.0.0-rc.3'
+
+import os
+import re
+
+def replace(file, pattern, subst):
+    # Read contents from file as a single string
+    file_handle = open(file, 'r')
+    file_string = file_handle.read()
+    file_handle.close()
+
+    # Use RE package to allow for replacement (also allowing for (multiline) REGEX)
+    file_string = (re.sub(pattern, subst, file_string))
+
+    # Write contents to file.
+    # Using mode 'w' truncates the file.
+    file_handle = open(file, 'w')
+    file_handle.write(file_string)
+    file_handle.close()
+
+def replace_version(path):
+    print(PREVIOUS_VERSION + " -> " + NEXT_VERSION + " (" + path + ")")
+    replace(path, "version = \"" + PREVIOUS_VERSION +"\"", "version = \"" + NEXT_VERSION +"\"")
+    replace(path, "version = \"=" + PREVIOUS_VERSION +"\"", "version = \"=" + NEXT_VERSION +"\"")
+    pass
+
+def replace_version_py(path):
+    print(PREVIOUS_VERSION + " -> " + NEXT_VERSION + " (" + path + ")")
+    replace(path, "target_version = \"" + PREVIOUS_VERSION +"\"", "target_version = \"" + NEXT_VERSION +"\"")
+    pass
+
+def replace_version_iss(path):
+    print(PREVIOUS_VERSION + " -> " + NEXT_VERSION + " (" + path + ")")
+    replace(path, "AppVersion=" + PREVIOUS_VERSION, "AppVersion=" + NEXT_VERSION)
+    pass
+
+for root, dirs, files in os.walk("."):
+    path = root.split(os.sep)
+    # print((len(path) - 1) * '---', os.path.basename(root))
+    for file in files:
+        if "Cargo.toml" in file:
+            replace_version(root + "/" + file)
+        elif "wasmer.iss" in file:
+            replace_version_iss(root + "/" + file)
+        elif "publish.py" in file:
+            replace_version_py(root + "/" + file)
+
+os.system("cargo generate-lockfile")