Fix syntax errors in HISTORY.rst

Author: aiudirog

HISTORY.rst

@@ -43,7 +43,7 @@ FUTURE: TBD
 - Update required httpx version for v0.22
 
 0.1.5.post1: 2021-12-15
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+-----------------------
 - Added support for Python 3.10
 
 0.1.5: 2021-11-15
@@ -59,7 +59,7 @@ FUTURE: TBD
 - Update required httpx version for v0.19
 
 0.1.2.post1: 2021-06-17
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+-----------------------
 - Fix HTTPX dependency mismatch between requirements.txt and setup.cfg
 
 0.1.2: 2021-04-27