The Fed raising rates has huge implications for the global economy and therefore bitcoin.
Rising rates:
Equal a stronger dollar.
Emerging market currencies are worth less (devalued).
Emerging markets who have debt denominated in dollars now have to pay those dollars back in weaker local currencies.
Reserve banks therefore have to use up more FX reserves to defend their currencies.
This leads to a dollar 'shortage' - this is best identified by observing the Eurodollar market (basically US dollars held outside the US financial system) and the LIBOR rate (which has been in uptrend for a while). This is not a good sign.
So, why how does this affect bitcoin?
If you have assets held in a devaluing currency (like almost every currency in relation to the US dollar) you are losing wealth.
Bitcoin is an asset outside government control.
Bitcoin is a way to transfer your money into a US dollar denominated asset (that also happens to be rising) and gives you the ability to transfer it anywhere in the world.
If your country has capital controls (China) then bitcoin is a way to elude them and preserve your wealth at the same time.
If your country has inflation (Venezuela) then bitcoin is a way to preserve your purchasing power
If your country is banning cash (Europe, India) and herding you into digitization then bitcoin is an asset outside your governments control.
If you are in another country and think this may come to your country then bitcoin is a great hedge & escape route to preserve and possibly increase your wealth.
Check out a chart of the devaluation of the Yuan (Chinese currency) and the price of bitcoin overlapped. It is almost identical. The last little while has seen a sharp spike in bitcoins price - this may be an indication of a coming devaluation of the Yuan (eventually this may lead to another 'China bans bitcoin' phase).
LIBOR today broke above 1% for the first time since May 2009 - Dollar shortage.