Create CHANGELOG.md

Author: AnonymousX86

docs/CHANGELOG.md

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+This file contains changes made to `Python Password` program.
+
+## Pre-Alpha
+
+### 0.1.0: May 2, 2020
+
+- First usable pre-release.
+- Added functions:
+  - setting password,
+  - getting password.
+
+### 0.1.1: May 3, 2020
+
+- Bugfixes, typos and idiot proofing.
+- Checking files' integrity more often.
+- More confirmations are needed.
+
+### 0.1.2: May 4, 2020
+
+- Cosmetic changes.
+- Checking files' integrity even more often.
+- Most od exceptions are handled properly.
+