Elapsed time precision changed (#93)

*  Code deployed will support every sql engine in sqlalchemy, converted from raw query to ORM layer and will solve issue #90

* Elapsed time can be greater than 100 seconds

flask_profiler/storage/sql_alchemy.py

@@ -22,7 +22,7 @@ class Measurements(base):
  id = Column(Integer, primary_key=True)
  startedAt = Column(Numeric)
  endedAt = Column(Numeric)
- elapsed = Column(Numeric(6, 4))
+ elapsed = Column(Numeric(10, 4))
  method = Column(Text)
  args = Column(Text)
  kwargs = Column(Text)