Rename gr_hist command to grhist (#585)

* rename grhist command

* Update README.md

gamestonk_terminal/options/README.md

@@ -26,7 +26,7 @@ This menu aims to give insight on options. Options can cause significant share p
   * Plot volume and open interest
 * [hist](#hist)
   * Plot option history [Source: Tradier.com]
-* [gr_hist](#gr_hist)
+* [grhist](#grhist)
    * Plot historical option greek [Source: ops.syncretism.io]
 
 
@@ -184,11 +184,11 @@ Note that the chain ID can be obtained by using `chains -d symbol`
 ![hist](https://user-images.githubusercontent.com/18151143/126855841-6884b19b-63c8-4746-a63f-82ad1a523c0c.png)
 
 
-## gr_hist <a name="gr_hist"></a>
+## grhist <a name="grhist"></a>
 Plot historical option greeks.  Data from ops.syncretism.io
 
 ```python
-usage: gr_hist [-s STRIKE] [--put] [-g {iv,gamma,theta,vega,delta,rho,premium}] [--chain CHAIN_ID] [--raw] [--export {csv,json,xlsx}] [-h]
+usage: grhist [-s STRIKE] [--put] [-g {iv,gamma,theta,vega,delta,rho,premium}] [--chain CHAIN_ID] [--raw] [--export {csv,json,xlsx}] [-h]
 ```
 * -s/--strike: Strike to show history for
 * -g/--greek: Greek to get data for.  Can be {iv,gamma,theta,vega,delta,rho}.  Also can be premium
@@ -198,6 +198,6 @@ usage: gr_hist [-s STRIKE] [--put] [-g {iv,gamma,theta,vega,delta,rho,premium}]
 * --export: Export file.  Can be {csv, json, xlsx}.
 
 ```python
-(✨) (op)> gr_hist -s 145 --put -g delta
+(✨) (op)> grhist -s 145 --put -g delta
 ```
 ![gr_hist](https://user-images.githubusercontent.com/18151143/126881002-c516d94b-5c87-43b1-9e16-dce304795e1c.png)

gamestonk_terminal/options/op_controller.py

@@ -47,7 +47,7 @@ class OptionsController:
         "oi",
         "hist",
         "chains",
-        "gr_hist",
+        "grhist",
     ]
 
     def __init__(self, ticker: str):
@@ -97,7 +97,7 @@ class OptionsController:
             print("   vol           plot volume [Tradier/YF]")
             print("   voi           plot volume and open interest [Tradier/YF]")
             print("   hist          plot option history [Tradier")
-            print("   gr_hist       plot option greek history [Syncretism]")
+            print("   grhist        plot option greek history [Syncretism]")
             print("")
 
     def switch(self, an_input: str):
@@ -243,7 +243,8 @@ class OptionsController:
                 options.calls, options.puts, self.ticker, self.selected_date, parsed
             )
 
-    def call_gr_hist(self, other_args: List[str]):
+    def call_grhist(self, other_args: List[str]):
+        """Process grhist command"""
         syncretism_view.historical_greeks(self.ticker, self.selected_date, other_args)
 
 

gamestonk_terminal/options/syncretism_view.py

@@ -252,7 +252,7 @@ def historical_greeks(ticker: str, expiry: str, other_args: List[str]):
     parser = argparse.ArgumentParser(
         add_help=False,
         formatter_class=argparse.ArgumentDefaultsHelpFormatter,
-        prog="gr_hist",
+        prog="grhist",
         description="Plot historical option greeks.",
     )